ACT Science - ACT Science
Card 0 of 21664
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (asleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (asleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy; however, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply to avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules, for future use during the next period of activity; furthermore, sleep allows the body to repair cellular damage that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
Which of the following is likely true of melatonin?
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (asleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (asleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy; however, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply to avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules, for future use during the next period of activity; furthermore, sleep allows the body to repair cellular damage that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
Which of the following is likely true of melatonin?
The passage states that "During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin."
This tells us that 1) melatonin causes the nervous system to induce a relaxed state and 2) melatonin levels are increased during sleep. Diurnal animals sleep at night, and thus will express high levels of melatonin at night.
The passage states that "During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin."
This tells us that 1) melatonin causes the nervous system to induce a relaxed state and 2) melatonin levels are increased during sleep. Diurnal animals sleep at night, and thus will express high levels of melatonin at night.
Compare your answer with the correct one above
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Yet, despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (sleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (sleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy. However, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules for future use during the next period of activity. Furthermore, sleep allows the body to repair cellular damages that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
Which of the following, if true, would most support Scientist 1?
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Yet, despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (sleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (sleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy. However, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules for future use during the next period of activity. Furthermore, sleep allows the body to repair cellular damages that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
Which of the following, if true, would most support Scientist 1?
Scientist 1 claims that sleep allows animals to conserve energy during times when food is less readily available. Thus, a bear sleeping because its food is unavailable supports Scientist 1's theory.
The only other answer involving food states "Bats that are given infinite food availability sleep more." According to Scientist 1, this would mean that the bats also have unlimited energy and would require less sleep. They would not need to conserve energy if they had unlimited food.
Scientist 1 claims that sleep allows animals to conserve energy during times when food is less readily available. Thus, a bear sleeping because its food is unavailable supports Scientist 1's theory.
The only other answer involving food states "Bats that are given infinite food availability sleep more." According to Scientist 1, this would mean that the bats also have unlimited energy and would require less sleep. They would not need to conserve energy if they had unlimited food.
Compare your answer with the correct one above
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Yet, despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (sleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (sleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy. However, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules for future use during the next period of activity. Furthermore, sleep allows the body to repair cellular damages that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
Which of the following, if true, would most support Scientist 2?
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Yet, despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (sleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (sleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy. However, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules for future use during the next period of activity. Furthermore, sleep allows the body to repair cellular damages that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
Which of the following, if true, would most support Scientist 2?
Scientist 2's theory states that "when animals are deprived of sleep, their immune system quickly weakens". Thus, when tigers are deprived of sleep, their immune systems would weaken and they would be likely to become sick.
The only other answer choice dealing with repairing damage and restoring the body is "Antelope that have been injured sleep less than those that are healthy". According to scientist 2, animals with more damage would likely sleep more to repair the damage, not less.
Scientist 2's theory states that "when animals are deprived of sleep, their immune system quickly weakens". Thus, when tigers are deprived of sleep, their immune systems would weaken and they would be likely to become sick.
The only other answer choice dealing with repairing damage and restoring the body is "Antelope that have been injured sleep less than those that are healthy". According to scientist 2, animals with more damage would likely sleep more to repair the damage, not less.
Compare your answer with the correct one above
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (asleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (asleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy; however, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply to avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules, for future use during the next period of activity; furthermore, sleep allows the body to repair cellular damage that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
Adenosine is a damaging by-product of the brain that is produced during waking hours. If Scientist 2’s theory is correct, which of the following is likely true?
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (asleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (asleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy; however, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply to avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules, for future use during the next period of activity; furthermore, sleep allows the body to repair cellular damage that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
Adenosine is a damaging by-product of the brain that is produced during waking hours. If Scientist 2’s theory is correct, which of the following is likely true?
According to Scientist 2, "sleep is necessary for animals to prevent accumulation of damage." Thus, if adenosine accumulates during waking hours, periods of sleep may be used to lower these levels. Adenosine will be high right before sleep and low right after. For a nocturnal animal, this means that adenosine will be high in the morning.
Note that Scientist 2 does not discuss energy or food consumption levels, so we can eliminate answers dealing with these concepts. Finally, we know that adenosine is damaging, and thus would not help an animal avoid illness.
According to Scientist 2, "sleep is necessary for animals to prevent accumulation of damage." Thus, if adenosine accumulates during waking hours, periods of sleep may be used to lower these levels. Adenosine will be high right before sleep and low right after. For a nocturnal animal, this means that adenosine will be high in the morning.
Note that Scientist 2 does not discuss energy or food consumption levels, so we can eliminate answers dealing with these concepts. Finally, we know that adenosine is damaging, and thus would not help an animal avoid illness.
Compare your answer with the correct one above
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Yet, despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (sleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (sleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy. However, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules for future use during the next period of activity. Furthermore, sleep allows the body to repair cellular damages that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
An animal is deprived of sleep for three days. According to Scientist 1?
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Yet, despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (sleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (sleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy. However, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules for future use during the next period of activity. Furthermore, sleep allows the body to repair cellular damages that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
An animal is deprived of sleep for three days. According to Scientist 1?
Scientist 1 argues that sleep is necessary in order to conserve energy. Thus, if an animal is deprived of sleep, they will have lower energy.
Scientist 2, however, might argue that the animal would become sick.
Scientist 1 argues that sleep is necessary in order to conserve energy. Thus, if an animal is deprived of sleep, they will have lower energy.
Scientist 2, however, might argue that the animal would become sick.
Compare your answer with the correct one above
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (asleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (asleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy; however, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply to avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules, for future use during the next period of activity; furthermore, sleep allows the body to repair cellular damage that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
Studies have shown that students who sleep well the night before an exam receive better marks. Why might this be, according to the hypotheses of both scientists?
Sleep plays a vital role in defining the daily activities of virtually all animals. During periods of sleep, the parasympathetic nervous system becomes active and induces a relaxed state in response to increased levels of the hormone melatonin. Despite its ubiquity in the animal kingdom, the purpose of sleep and its role in our daily lives has been disputed by scientists. Two scientists discuss their theories about the purpose of sleep.
Scientist 1
During periods of sleep, animals are able to conserve energy that they would otherwise be spending on unnecessary activity. If an animal’s primary food source is most abundant during daylight, it is a waste of precious energy to be moving about at night. For example, many herbivores, such as squirrels, are diurnal (asleep during the night) because their food source is available during the day, while many insectivores, such as bats, are nocturnal (asleep during the day) because their food source is available during the night. Food sources, as an animal’s most valuable resource, dictate their sleep cycles. Many animal traits observable today evolved as a result of the supply and demand of food in their natural habitat.
Scientist 2
During waking hours, it is true that the body utilizes large amounts of energy; however, the role of sleep is to restore biological products that were utilized during periods of wakefulness, rather than simply to avoid utilizing energy in the first place. Many types of biological molecules, such as hormones, are released throughout the body while an animal is active. Sleep serves as a period of inactivity during which the body can manufacture and store a supply of these molecules, for future use during the next period of activity; furthermore, sleep allows the body to repair cellular damage that has accumulated during waking hours. Experimental evidence shows that when animals are deprived of sleep, their immune system quickly weakens and death rates increase. Sleep is necessary for animals to prevent accumulation of damage and to regenerate crucial biomolecules for daily life.
Studies have shown that students who sleep well the night before an exam receive better marks. Why might this be, according to the hypotheses of both scientists?
This question combines the two passage theories. "Students who sleep more have more energy and restored molecular balance" is the best answer because it reflects the viewpoints of both scientists.
This question combines the two passage theories. "Students who sleep more have more energy and restored molecular balance" is the best answer because it reflects the viewpoints of both scientists.
Compare your answer with the correct one above
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesize that high levels of calcium would interact with the proteins Cs3 and Gfy, which would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums—one medium lacking calcium (plate A), and one medium with supplemented calcium (plate B)
According to the experiment, what data results would support the hypothesis?
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesize that high levels of calcium would interact with the proteins Cs3 and Gfy, which would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums—one medium lacking calcium (plate A), and one medium with supplemented calcium (plate B)
According to the experiment, what data results would support the hypothesis?
To support the hypothesis, the data would need to show that calcium increased the gene activity. Plate B has the supplemented calcium growth medium; therefore, increased gene activity in those plates would support the hypothesis.
To support the hypothesis, the data would need to show that calcium increased the gene activity. Plate B has the supplemented calcium growth medium; therefore, increased gene activity in those plates would support the hypothesis.
Compare your answer with the correct one above
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesize that high levels of calcium would interact with the proteins Cs3 and Gfy, which in turn would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums—one medium lacking calcium (plate A), and one medium with supplemented calcium (plate B)
If the experiment showed that calcium increased F4597 gene activity but decreased BC392 activity, what could one conclude?
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesize that high levels of calcium would interact with the proteins Cs3 and Gfy, which in turn would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums—one medium lacking calcium (plate A), and one medium with supplemented calcium (plate B)
If the experiment showed that calcium increased F4597 gene activity but decreased BC392 activity, what could one conclude?
The hypothesis stated the calcium manipulation would increase F4597 and BC392 activity; therefore, a result that showed decreased activity in the BC392 gene would contradict the hypothesis. Further, the hypothesis mentions that the calcium would "interact" with the proteins, but does not specific what type of interaction whether it be an increase or decrease of protein activity.
The hypothesis stated the calcium manipulation would increase F4597 and BC392 activity; therefore, a result that showed decreased activity in the BC392 gene would contradict the hypothesis. Further, the hypothesis mentions that the calcium would "interact" with the proteins, but does not specific what type of interaction whether it be an increase or decrease of protein activity.
Compare your answer with the correct one above
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesize that high levels of calcium would interact with the proteins Cs3 and Gfy, which in turn would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums—one medium lacking calcium (plate A), and one medium with supplemented calcium (plate B)
What new information would weaken this experiment?
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesize that high levels of calcium would interact with the proteins Cs3 and Gfy, which in turn would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums—one medium lacking calcium (plate A), and one medium with supplemented calcium (plate B)
What new information would weaken this experiment?
Researching showing isolated Ca++ does not affect proteins undermines the root of this experimental design and hypothesis because it looks at the sole effects of Ca++ on proteins.
Researching showing isolated Ca++ does not affect proteins undermines the root of this experimental design and hypothesis because it looks at the sole effects of Ca++ on proteins.
Compare your answer with the correct one above
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesize that high levels of calcium would interact with the proteins Cs3 and Gfy, which in turn would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums—one medium lacking calcium (plate A), and one medium with supplemented calcium (plate B)
Would new information about the lack of absorption of calcium through a growth medium strengthen or weaken this experiment and why?
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesize that high levels of calcium would interact with the proteins Cs3 and Gfy, which in turn would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums—one medium lacking calcium (plate A), and one medium with supplemented calcium (plate B)
Would new information about the lack of absorption of calcium through a growth medium strengthen or weaken this experiment and why?
Information showing that calclum is not properly absorbed into growth mediums would weaken the experiment because it would skew the results for Plate B and create a smaller contrast between Plate A and Plate B.
Information showing that calclum is not properly absorbed into growth mediums would weaken the experiment because it would skew the results for Plate B and create a smaller contrast between Plate A and Plate B.
Compare your answer with the correct one above
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesized that high levels of calcium would interact with the proteins Cs3 and Gfy, which in turn would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums- one medium lacking calcium (plate A) and one medium with supplemented calcium (plate B)
What result would disprove the hypothesis?
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesized that high levels of calcium would interact with the proteins Cs3 and Gfy, which in turn would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums- one medium lacking calcium (plate A) and one medium with supplemented calcium (plate B)
What result would disprove the hypothesis?
If both Plate A and Plate B had equal gene activity, it would mean that calcium levels did not affect the proteins or the gene activity. This would disprove the hypothesis, which stated that calcium would increase the transcription of the genes.
If both Plate A and Plate B had equal gene activity, it would mean that calcium levels did not affect the proteins or the gene activity. This would disprove the hypothesis, which stated that calcium would increase the transcription of the genes.
Compare your answer with the correct one above
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesized that high levels of calcium would interact with the proteins Cs3 and Gfy, which in turn would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums- one medium lacking calcium (plate A) and one medium with supplemented calcium (plate B)
What might it suggest if both plates were found to have no gene activity?
A scientific experiment is conducted to test if calcium can affect gene regulation. Scientists hypothesized that high levels of calcium would interact with the proteins Cs3 and Gfy, which in turn would increase the transcription of genes F4597 and BC392. The experiment procedure is summarized below.
- Isolate the genes F4597 and BC392.
- Create a vector within yeast cells containing the two genes
- Culture yeast cells
- Grow yeast cells in different growth mediums- one medium lacking calcium (plate A) and one medium with supplemented calcium (plate B)
What might it suggest if both plates were found to have no gene activity?
All of the possible statements are situations that could exist within this experiment. It is very possible contamination took place. If the vectors were not done properly, then the genes might even be in the yeast cells, which would show up as no gene activity. It is also always possible an outside factor not addressed in the experiment is interferring with the results.
All of the possible statements are situations that could exist within this experiment. It is very possible contamination took place. If the vectors were not done properly, then the genes might even be in the yeast cells, which would show up as no gene activity. It is also always possible an outside factor not addressed in the experiment is interferring with the results.
Compare your answer with the correct one above
Mitochondria make 90% of the energy needed by the body to sustain life. The Mitochondrial Free Radical Theory of Aging (MFRTA) theorizes that individuals who live longest produce fewer mitochondrial oxygen reactive species than individuals that have a shorter life span. Therefore, lifespan will increase if fewer mtROS are produced, and lifespan will decrease if more mtROS are produced. An experiment was done to test this theory, and the results are shown in the chart below. Four test groups of flies were involved, two groups consisted of females, and two groups consisted of males.
| | Test group 1 | Test group 2 | Test group 3 | Test group 4 | |
| ------------------- | ---------------- | ---------------- | ---------------- | ------- |
| # of mtROS | 3.9 | 2.5 | 3.2 | 2.7 |
| Lifespan | 110 days | 120 days | 95 days | 89 days |
Based on this experiment, a test group living in a low oxygen environment would:
Mitochondria make 90% of the energy needed by the body to sustain life. The Mitochondrial Free Radical Theory of Aging (MFRTA) theorizes that individuals who live longest produce fewer mitochondrial oxygen reactive species than individuals that have a shorter life span. Therefore, lifespan will increase if fewer mtROS are produced, and lifespan will decrease if more mtROS are produced. An experiment was done to test this theory, and the results are shown in the chart below. Four test groups of flies were involved, two groups consisted of females, and two groups consisted of males.
| | Test group 1 | Test group 2 | Test group 3 | Test group 4 | | | ------------------- | ---------------- | ---------------- | ---------------- | ------- | | # of mtROS | 3.9 | 2.5 | 3.2 | 2.7 | | Lifespan | 110 days | 120 days | 95 days | 89 days |
Based on this experiment, a test group living in a low oxygen environment would:
We do not know the relationship between a low-oxygen environment and the mtROS amount. One might hypothesize that a low-oxygen environment would lower the influence of the mitochondrial oxygen reactive species because there is less oxygen to react with. However, this experiment does not begin to address this issue, therefore no conclusion can be made.
We do not know the relationship between a low-oxygen environment and the mtROS amount. One might hypothesize that a low-oxygen environment would lower the influence of the mitochondrial oxygen reactive species because there is less oxygen to react with. However, this experiment does not begin to address this issue, therefore no conclusion can be made.
Compare your answer with the correct one above
A new drug is in its clinical trial phase. The graph below shows the data for participants sleep patterns before medication use and then after using the medication for three months. Series 1 shows the average hours slept a night for each participant prior to medication. Series 2 shows the average hours slept a night for each participant after three months of use. The average hours slept a night was obtained by recording sleep every night for one month, and then finding the average. Patients one through five took a placebo pil, not the actual Moonlight medication. Note: The y-axis is measured in hours slept a night, while the x-axis lists each anonymous patient numerically.
If Patient 1, Patient 2, and Patient 3 were all females, you could infer from the data given that .
A new drug is in its clinical trial phase. The graph below shows the data for participants sleep patterns before medication use and then after using the medication for three months. Series 1 shows the average hours slept a night for each participant prior to medication. Series 2 shows the average hours slept a night for each participant after three months of use. The average hours slept a night was obtained by recording sleep every night for one month, and then finding the average. Patients one through five took a placebo pil, not the actual Moonlight medication. Note: The y-axis is measured in hours slept a night, while the x-axis lists each anonymous patient numerically.
If Patient 1, Patient 2, and Patient 3 were all females, you could infer from the data given that .
The placebo was given to patient 1 through patient 5; patient 4 and patient 5 are males. Patient 4 and Patient 5 reported a much larger increase in average hours slept a night, while the female patients given the placebo reported a smaller change in average hours slept a night. According to the chart, the first three patients saw an average increase of about one hour of sleep a night. Patient 4 and Patient 5 saw an average increase of at least two hours of sleep a night.
The placebo was given to patient 1 through patient 5; patient 4 and patient 5 are males. Patient 4 and Patient 5 reported a much larger increase in average hours slept a night, while the female patients given the placebo reported a smaller change in average hours slept a night. According to the chart, the first three patients saw an average increase of about one hour of sleep a night. Patient 4 and Patient 5 saw an average increase of at least two hours of sleep a night.
Compare your answer with the correct one above
Scientists studied a species of termites and looked at their foraging habitats across the United States. The termite’s population in a given tree was measured by the level of decomposition within a tree due to the termites eating the bark. The experiment also kept track of the level of shade tolerance for each species of tree. For the species of trees in this experiment, shade tolerance fell into two main categorizes- shade tolerant (ST) and intermediate shade (IS). Lastly, they recorded the average amount of rainfall in that given month for the species location being observed. The chart below summarizes the data. Scientists hypothesized that the level of decomposition would be highest in tree species with a higher average rainfall. In addition, they hypothesized trees allowing more shade would allow for more termites, and in turn more decomposition.
| | Tsuga canadensis | Morus rubra | Pinus strobus | Acer rubrum | Arbutus menziesii | Quercus lobata | Juniperus scopulorum | |
| ------------------------------ | --------------- | ----------------- | --------------- | --------------------- | ------------------ | ------------------------ | ----- |
| Decomposition (in ccm) | 2.38 | 3.21 | 1.01 | .970 | 2.89 | 1.31 | 4.03 |
| Shade tolerance | ST | ST | IS | IS | ST | IS | ST |
| Average rainfall | 47.27 | 50.89 | 43.26 | 41.65 | 46.87 | 44.98 | 52.75 |
According to the data in the chart, did the experiment support or disprove their hypothesis?
Scientists studied a species of termites and looked at their foraging habitats across the United States. The termite’s population in a given tree was measured by the level of decomposition within a tree due to the termites eating the bark. The experiment also kept track of the level of shade tolerance for each species of tree. For the species of trees in this experiment, shade tolerance fell into two main categorizes- shade tolerant (ST) and intermediate shade (IS). Lastly, they recorded the average amount of rainfall in that given month for the species location being observed. The chart below summarizes the data. Scientists hypothesized that the level of decomposition would be highest in tree species with a higher average rainfall. In addition, they hypothesized trees allowing more shade would allow for more termites, and in turn more decomposition.
| | Tsuga canadensis | Morus rubra | Pinus strobus | Acer rubrum | Arbutus menziesii | Quercus lobata | Juniperus scopulorum | | | ------------------------------ | --------------- | ----------------- | --------------- | --------------------- | ------------------ | ------------------------ | ----- | | Decomposition (in ccm) | 2.38 | 3.21 | 1.01 | .970 | 2.89 | 1.31 | 4.03 | | Shade tolerance | ST | ST | IS | IS | ST | IS | ST | | Average rainfall | 47.27 | 50.89 | 43.26 | 41.65 | 46.87 | 44.98 | 52.75 |
According to the data in the chart, did the experiment support or disprove their hypothesis?
As stated in the prompt, scientists hypothesized the level of decomposition would be highest in tree species with a higher average rainfall. In addition, they hypothesized trees allowing more shade would allow for more termites, and in turn more decomposition.
As stated in the prompt, scientists hypothesized the level of decomposition would be highest in tree species with a higher average rainfall. In addition, they hypothesized trees allowing more shade would allow for more termites, and in turn more decomposition.
Compare your answer with the correct one above
Scientists studied a species of termites and looked at their foraging habitats across the United States. The termite’s population in a given tree was measured by the level of decomposition within a tree due to the termites eating the bark. The experiment also kept track of the level of shade tolerance for each species of tree. For the species of trees in this experiment, shade tolerance fell into two main categorizes- shade tolerant (ST) and intermediate shade (IS). Lastly, they recorded the average amount of rainfall in that given month for the species location being observed. The chart below summarizes the data. Scientists hypothesized that the level of decomposition would be highest in tree species with a higher average rainfall. In addition, they hypothesized trees allowing more shade would allow for more termites, and in turn more decomposition.
| | Tsuga canadensis | Morus rubra | Pinus strobus | Acer rubrum | Arbutus menziesii | Quercus lobata | Juniperus scopulorum | |
| ------------------------------ | --------------- | ----------------- | --------------- | --------------------- | ------------------ | ------------------------ | ----- |
| Decomposition (in ccm) | 2.38 | 3.21 | 1.01 | .970 | 2.89 | 1.31 | 4.03 |
| Shade tolerance | ST | ST | IS | IS | ST | IS | ST |
| Average rainfall | 47.27 | 50.89 | 43.26 | 41.65 | 46.87 | 44.98 | 52.75 |
Based on this experiment, the optimal foraging habitats of termites can best be described as .
Scientists studied a species of termites and looked at their foraging habitats across the United States. The termite’s population in a given tree was measured by the level of decomposition within a tree due to the termites eating the bark. The experiment also kept track of the level of shade tolerance for each species of tree. For the species of trees in this experiment, shade tolerance fell into two main categorizes- shade tolerant (ST) and intermediate shade (IS). Lastly, they recorded the average amount of rainfall in that given month for the species location being observed. The chart below summarizes the data. Scientists hypothesized that the level of decomposition would be highest in tree species with a higher average rainfall. In addition, they hypothesized trees allowing more shade would allow for more termites, and in turn more decomposition.
| | Tsuga canadensis | Morus rubra | Pinus strobus | Acer rubrum | Arbutus menziesii | Quercus lobata | Juniperus scopulorum | | | ------------------------------ | --------------- | ----------------- | --------------- | --------------------- | ------------------ | ------------------------ | ----- | | Decomposition (in ccm) | 2.38 | 3.21 | 1.01 | .970 | 2.89 | 1.31 | 4.03 | | Shade tolerance | ST | ST | IS | IS | ST | IS | ST | | Average rainfall | 47.27 | 50.89 | 43.26 | 41.65 | 46.87 | 44.98 | 52.75 |
Based on this experiment, the optimal foraging habitats of termites can best be described as .
The experimental data shows that the greatest amount of termites are found in trees that have a high shade tolerance and get a lot of rain.
The experimental data shows that the greatest amount of termites are found in trees that have a high shade tolerance and get a lot of rain.
Compare your answer with the correct one above
An experiment was done to look at the effects of iodine supplements on the production of the thyroid hormone thyroxine. Individuals in the study were divided into categorizes based on the dosage of iodine supplemented. The chart below summarizes the data collected. THY1 is the average amount of thyroxine in the group prior to taking the supplement. THY2 is the average amount of thyroxine in the group after three months of taking supplements.
| | THY1 | Dosage of Iodine | THY2 | |
| ----------- | -------------------- | -------- | ----- |
| Group 1 | 3.220 | 0 | 3.289 |
| Group 2 | 2.988 | 0 | 3.102 |
| Group 3 | 3.134 | 1mmg | 3.248 |
| Group 4 | 3.387 | 3mmg | 4.001 |
| Group 5 | 3.024 | 6mmg | 5.830 |
Group 2 was given a placebo supplement, which shows:
An experiment was done to look at the effects of iodine supplements on the production of the thyroid hormone thyroxine. Individuals in the study were divided into categorizes based on the dosage of iodine supplemented. The chart below summarizes the data collected. THY1 is the average amount of thyroxine in the group prior to taking the supplement. THY2 is the average amount of thyroxine in the group after three months of taking supplements.
| | THY1 | Dosage of Iodine | THY2 | | | ----------- | -------------------- | -------- | ----- | | Group 1 | 3.220 | 0 | 3.289 | | Group 2 | 2.988 | 0 | 3.102 | | Group 3 | 3.134 | 1mmg | 3.248 | | Group 4 | 3.387 | 3mmg | 4.001 | | Group 5 | 3.024 | 6mmg | 5.830 |
Group 2 was given a placebo supplement, which shows:
Group 2 had a higher thyroxine increase ( a .114 difference) than the thyroxine increase in Group 1 (0.069).
Group 2 had a higher thyroxine increase ( a .114 difference) than the thyroxine increase in Group 1 (0.069).
Compare your answer with the correct one above
An experiment was done to look at the effects of iodine supplements on the production of the thyroid hormone thyroxine. Individuals in the study were divided into categorizes based on the dosage of iodine supplemented. The chart below summarizes the data collected. THY1 is the average amount of thyroxine in the group prior to taking the supplement. THY2 is the average amount of thyroxine in the group after three months of taking supplements.
| | THY1 | Dosage of Iodine | THY2 | |
| ----------- | -------------------- | -------- | ----- |
| Group 1 | 3.220 | 0 | 3.289 |
| Group 2 | 2.988 | 0 | 3.102 |
| Group 3 | 3.134 | 1mmg | 3.248 |
| Group 4 | 3.387 | 3mmg | 4.001 |
| Group 5 | 3.024 | 6mmg | 5.830 |
The results of the experiment show:
An experiment was done to look at the effects of iodine supplements on the production of the thyroid hormone thyroxine. Individuals in the study were divided into categorizes based on the dosage of iodine supplemented. The chart below summarizes the data collected. THY1 is the average amount of thyroxine in the group prior to taking the supplement. THY2 is the average amount of thyroxine in the group after three months of taking supplements.
| | THY1 | Dosage of Iodine | THY2 | | | ----------- | -------------------- | -------- | ----- | | Group 1 | 3.220 | 0 | 3.289 | | Group 2 | 2.988 | 0 | 3.102 | | Group 3 | 3.134 | 1mmg | 3.248 | | Group 4 | 3.387 | 3mmg | 4.001 | | Group 5 | 3.024 | 6mmg | 5.830 |
The results of the experiment show:
The greater the dosage of iodine supplements administered, the greater the increase in thyroxine levels.
The greater the dosage of iodine supplements administered, the greater the increase in thyroxine levels.
Compare your answer with the correct one above
An experiment was done to look at the effects of iodine supplements on the production of the thyroid hormone thyroxine. Individuals in the study were divided into categorizes based on the dosage of iodine supplemented. The chart below summarizes the data collected. THY1 is the average amount of thyroxine in the group prior to taking the supplement. THY2 is the average amount of thyroxine in the group after three months of taking supplements.
| | THY1 | Dosage of Iodine | THY2 | |
| ----------- | -------------------- | -------- | ----- |
| Group 1 | 3.220 | 0 | 3.289 |
| Group 2 | 2.988 | 0 | 3.102 |
| Group 3 | 3.134 | 1mmg | 3.248 |
| Group 4 | 3.387 | 3mmg | 4.001 |
| Group 5 | 3.024 | 6mmg | 5.830 |
The results of this experiment strengthen the theory that:
An experiment was done to look at the effects of iodine supplements on the production of the thyroid hormone thyroxine. Individuals in the study were divided into categorizes based on the dosage of iodine supplemented. The chart below summarizes the data collected. THY1 is the average amount of thyroxine in the group prior to taking the supplement. THY2 is the average amount of thyroxine in the group after three months of taking supplements.
| | THY1 | Dosage of Iodine | THY2 | | | ----------- | -------------------- | -------- | ----- | | Group 1 | 3.220 | 0 | 3.289 | | Group 2 | 2.988 | 0 | 3.102 | | Group 3 | 3.134 | 1mmg | 3.248 | | Group 4 | 3.387 | 3mmg | 4.001 | | Group 5 | 3.024 | 6mmg | 5.830 |
The results of this experiment strengthen the theory that:
When looking at the chart, the higher the thyroxine level, the greater the difference between THY1 and THY2.
When looking at the chart, the higher the thyroxine level, the greater the difference between THY1 and THY2.
Compare your answer with the correct one above
There is a certain species of rabbit that is known to reproduce quickly. 250 of these rabbits were introduced into a new environment, and their population was measured in ten year intervals.
Which of the following would be the most accurate conclusion for this experiment?
There is a certain species of rabbit that is known to reproduce quickly. 250 of these rabbits were introduced into a new environment, and their population was measured in ten year intervals.
Which of the following would be the most accurate conclusion for this experiment?
The population increases exponentially. It increases by 0.4 in the first decade, 0.73 in the second, 1.05 in the third, etc. The ever increasing rate of change tells us that the population is not increasing at a constant rate, but instead at an exponential rate.
We cannot draw conclusions about the effect of the environment, as there is no existing data about other environments to compare with the experimental data.
The population increases exponentially. It increases by 0.4 in the first decade, 0.73 in the second, 1.05 in the third, etc. The ever increasing rate of change tells us that the population is not increasing at a constant rate, but instead at an exponential rate.
We cannot draw conclusions about the effect of the environment, as there is no existing data about other environments to compare with the experimental data.
Compare your answer with the correct one above