- A student tries to summarize a model of digestion with a before-and-after comparison.
Before: Food molecules enter an organism.
After: Smaller molecules are present, and some are rearranged into new molecules.
Which statement about food breakdown is supported by evidence from this model?
Answer: Digestion breaks down and rearranges food molecules into smaller molecules that can be used to form new molecules.
The core skill is summarizing digestion models to support accurate statements about food breakdown. Digestion breaks food into smaller molecules that the body can process and absorb. These molecules are rearranged into new forms without any loss of matter. Models demonstrate this through comparisons of initial and final molecular states. One misconception is that food turns directly into energy without remaining as matter, but it is conserved and transformed. Breaking down food ensures cells receive nutrients in a usable format. Overall, this makes dietary materials accessible for cellular use in growth and metabolism.
- A simplified model shows: a grape enters a worm → the grape molecules are broken down into smaller molecules → the smaller molecules are rearranged into molecules that help the worm grow.
Which statement about food breakdown is supported by this model's evidence?
Answer: The grape molecules are broken down into smaller molecules, and those smaller molecules are rearranged into molecules used by the worm.
This question assesses understanding of how models represent food breakdown at the molecular level. During digestion, food molecules are broken down into smaller component molecules through chemical reactions. These smaller molecules serve as building blocks that can be rearranged into new molecular structures the organism needs for growth and maintenance. The model correctly shows grape molecules being broken down and then rearranged into molecules used by the worm. A misconception is that food turns directly into energy with no matter remaining, but energy release is separate from molecular rearrangement. The breakdown of food molecules into smaller units allows organisms to rebuild them into the specific molecules their cells require for structure and function.
- A diagram-model of digestion shows: Before: a large "food molecule" enters a bird. During: it is broken into several smaller molecules. After: the smaller molecules are rearranged into two groups—some become part of feather material, and some remain as smaller molecules moving to cells. Digestion breaks down and rearranges food molecules. Which statement about food breakdown is supported by evidence from this model?
Answer: Food molecules are broken down into smaller molecules and rearranged into new molecules used in the bird's body.
The core skill in middle-school life science is modeling how food is broken down during digestion to provide usable materials for organisms. Digestion breaks food into smaller molecules through mechanical and chemical processes in the mouth, stomach, and intestines. These molecules are rearranged into new forms, not destroyed, conserving matter as they become part of the body's tissues or energy sources. Models illustrate this change by showing before-and-after representations, such as large food particles dividing into smaller ones that then combine differently inside the organism. A common misconception is that food disappears or turns directly into energy, but actually, its atoms are repurposed without loss of matter. Breaking down food allows organisms to absorb nutrients efficiently, making essential building blocks available for growth and repair. Ultimately, this process ensures that cells can use rearranged molecules for functions like building muscles or producing energy.
- A student makes a model of digestion: a cracker enters a bird, then the cracker is broken into many small pieces, and later those small pieces are rearranged into new molecules that become part of the bird's body. Which statement about food breakdown is supported by this model and the evidence shown before-and-after?
Remember: digestion breaks down and rearranges food molecules (they do not disappear).
Answer: The cracker molecules are broken down into smaller molecules, and those smaller molecules are rearranged to make new molecules in the bird.
This question tests understanding of modeling food breakdown during digestion. During digestion, food molecules are broken down into smaller molecules through chemical processes, not just physical crushing. These smaller molecules can then be rearranged and combined in new ways to build molecules the organism needs, like proteins for growth or repair. Models that accurately represent digestion show this two-step process: breakdown followed by rearrangement. A common misconception is that food simply disappears or turns directly into energy, but matter is conserved—the atoms from food molecules are reorganized, not destroyed. This breakdown and rearrangement process allows organisms to convert food into usable materials for their cells.
- A model shows a piece of food entering an organism. Inside, the model shows the food first broken into smaller molecules. Next, it shows those smaller molecules rearranged into molecules that become part of the organism's body. Which prediction about breakdown is supported by the model if the food were not broken down into smaller molecules?
Reminder: digestion breaks down and rearranges food molecules.
Answer: It would be harder for the organism to rearrange the food into new molecules, because the model shows rearrangement happening after smaller molecules are made.
The core skill in modeling food breakdown is making predictions based on models about what happens if digestion steps are altered. Digestion breaks food into smaller molecules, a crucial step for further processing inside the organism. These molecules are then rearranged into usable forms, not destroyed, to build body structures. Models show this by depicting sequential changes, from breakdown to rearrangement, highlighting dependencies. A misconception is that breakdown is unnecessary for rearrangement, but models indicate it's foundational. Breaking down food ensures materials are in a form cells can manipulate. Generally, this enables organisms to efficiently use food for growth and energy needs.
- Two students argue about what counts as digestion in a model.
Student 1: "Digestion is just chewing, because the food is broken into smaller pieces."
Student 2: "Digestion breaks down food molecules into smaller molecules and rearranges them into new molecules."
A model shows: Food enters → smaller molecules form inside the organism → some smaller molecules are rearranged into new molecules.
Which statement is supported by evidence in the model?
Answer: Student 2 is correct because the model shows food molecules broken down into smaller molecules and then rearranged.
The core skill is determining which student's view aligns with model evidence of digestion and food breakdown. Digestion breaks food into smaller molecules beyond just physical chewing, involving chemical changes. The smaller units are rearranged into new molecules, conserving matter throughout. Models illustrate this by showing internal molecular changes and recombinations. A misconception is equating digestion solely to chewing, but it includes molecular rearrangement. Breaking down food provides cells with versatile components for synthesis. This process makes food materials usable by cells for sustaining energy and structure.
- Two students make before-and-after models of the same snack entering an organism.
Model 1: A large food molecule enters the organism. Inside, it is shown as several smaller molecules. Later, those smaller molecules are shown connected in a new arrangement that becomes part of the organism.
Model 2: A large food molecule enters the organism. Inside, it is shown as the same large molecule, only drawn smaller. Later, it is shown as "energy" with no molecules shown.
Which claim about digestion is incorrect based on the evidence in the models and the idea that digestion breaks down and rearranges food molecules?
Answer: Digestion makes the food molecules disappear completely, so no molecules remain after digestion.
The core skill in modeling food breakdown is using evidence from models to identify correct and incorrect claims about digestion. Digestion breaks food into smaller molecules, enabling the body to process complex foods like snacks into simpler components. Importantly, these molecules are rearranged into new forms that become part of the organism, not destroyed, preserving the matter. Models demonstrate this by showing before-and-after states, where molecules are broken down and then reconfigured, providing evidence of transformation. One misconception is that digestion makes molecules vanish into energy, but models reveal they persist in new arrangements. Breaking down food makes its materials usable by cells for building tissues and performing functions. This generalization highlights how digestion supports the organism's ability to grow and maintain itself using ingested matter.
- A model shows: (Before) a large food molecule enters an organism. (During digestion) it is broken down into several smaller molecules. (After) the smaller molecules are rearranged into a different set of molecules that can be used by the organism.
What evidence from this before-and-after model most clearly shows rearrangement of molecules (not disappearance)?
Answer: In the after part, the small molecules are shown connected in new groupings compared with the during-digestion part.
This question examines evidence in models that demonstrates food breakdown and molecular rearrangement. During digestion, large food molecules are broken into smaller molecules through chemical reactions. The key evidence for rearrangement is showing these smaller molecules forming new combinations—different molecular structures than the original food. Models effectively demonstrate this by showing small molecules connected in new groupings after digestion, not just showing size reduction. A misconception is thinking that smaller size alone indicates molecular change, when physical breaking (like chewing) differs from chemical breakdown. The rearrangement of molecules after breakdown allows organisms to build the specific molecules their cells need from the raw materials in food.
- A diagram model is shown below.
It shows: (1) a food molecule entering an organism, (2) the food molecule becoming several smaller molecules inside, and (3) those smaller molecules rearranged into a different molecule labeled "new body molecule."
Which statement about food breakdown is supported by the model and its evidence from before-and-after changes?
Reminder: digestion breaks down and rearranges food molecules.
Answer: The model shows food being broken down into smaller molecules and rearranged into new molecules, so the matter is changed but not destroyed.
The core skill in modeling food breakdown is analyzing diagram models to support statements using before-and-after evidence. Digestion breaks food into smaller molecules, facilitating their absorption and use in the body. These molecules are rearranged into new forms, not destroyed, to contribute to the organism's structure. Models illustrate this through visuals of entry, breakdown, and reconfiguration into body molecules. A misconception is that models showing more pieces indicate matter creation, but it's merely division and rearrangement. Breaking down food allows cells to access nutrients effectively. This general principle shows how digestion transforms food into vital cellular resources.
- Four students describe models of what happens to a cracker in the body. Digestion breaks down and rearranges food molecules. Which model shows food entering an organism and being broken down into smaller components that are rearranged (not destroyed)?
Answer: Cracker enters → is shown as several smaller molecules → those smaller molecules are rearranged into new molecules used by cells.
The core skill in middle-school life science is modeling how food is broken down during digestion to provide usable materials for organisms. Digestion breaks food into smaller molecules through mechanical and chemical processes in the mouth, stomach, and intestines. These molecules are rearranged into new forms, not destroyed, conserving matter as they become part of the body's tissues or energy sources. Models illustrate this change by showing before-and-after representations, such as large food particles dividing into smaller ones that then combine differently inside the organism. A common misconception is that food disappears or turns directly into energy, but actually, its atoms are repurposed without loss of matter. Breaking down food allows organisms to absorb nutrients efficiently, making essential building blocks available for growth and repair. Ultimately, this process ensures that cells can use rearranged molecules for functions like building muscles or producing energy.
- A model of digestion uses colored blocks to represent molecules. Before: a long chain of blocks (food molecule) enters an organism. During: the chain is broken into shorter chains (smaller molecules). After: the blocks are rearranged into two different shapes (new molecules) that become part of the organism.
Which statement about food breakdown is supported by evidence in this model?
Answer: The food molecule is broken down into smaller molecules, and the same blocks are rearranged into new molecules used by the organism.
This question tests interpretation of abstract models showing food breakdown at the molecular level. During digestion, large food molecules are chemically broken into smaller component molecules. These smaller molecules, represented by the same blocks rearranged differently, can form new molecular structures needed by the organism. The model effectively uses blocks to show conservation of matter—the same components (blocks) are present before and after, just arranged differently. A misconception is that models must be literal representations or that different shapes mean matter disappeared. The blocks represent atoms or molecular units that get rearranged, not destroyed. This molecular breakdown and rearrangement enables organisms to transform diverse foods into the specific molecules their cells require.
- A student draws a model of what happens to a bite of food. The model shows: (1) a piece of food entering an organism, (2) the food being broken down into smaller pieces inside, and (3) the smaller pieces being rearranged into new molecules that become part of the organism. Which statement about food breakdown is supported by the model and its before-and-after comparison, using evidence from what is shown?
Reminder: digestion breaks down and rearranges food molecules.
Answer: Digestion breaks food into smaller molecules and rearranges them into different molecules that can become part of the organism.
The core skill in modeling food breakdown is understanding how digestion transforms food into usable materials for an organism. Digestion breaks food into smaller molecules by separating the large molecules in food through chemical processes in the digestive system. These smaller molecules are then rearranged into new molecules that the organism can use, rather than being destroyed or lost. Models show this change by illustrating a before-and-after comparison, where large food molecules enter and are depicted as broken down and reorganized into body molecules. A common misconception is that food disappears after digestion, but actually, the matter is conserved and transformed. Breaking down food into smaller molecules allows cells to access and utilize these building blocks for growth and repair. Ultimately, this process ensures that the materials from food become integrated into the organism's structure, supporting its survival and function.
- A student is checking a classmate's model of digestion:
Before: a piece of pasta enters a lizard.
During: the pasta is shown as smaller molecules.
After: the lizard has "new body molecules," but the model shows no connection between the smaller molecules and the new body molecules.
Which change would best fix the model so it shows evidence that digestion breaks down and rearranges food molecules (not destroys them)?
Answer: Add arrows showing the smaller molecules being rearranged into the new body molecules after digestion.
This question addresses improving models to show food breakdown and molecular rearrangement. Effective digestion models must show both breakdown of food molecules into smaller molecules and their subsequent rearrangement into new body molecules. The current model shows breakdown but fails to connect the smaller molecules to the new body molecules, leaving the rearrangement step unclear. Adding arrows to show smaller molecules being rearranged would complete the model by demonstrating conservation of matter. A misconception is that food disappears or turns only into energy during digestion, but atoms are conserved and reorganized. Showing the connection between breakdown products and new molecules helps students understand how organisms convert food materials into usable cellular components.
- Two students describe what happens to food during digestion.
Student 1: "Food is broken down into smaller molecules, and the smaller molecules can be rearranged to build parts of the organism."
Student 2: "Food is destroyed in the stomach, so the original molecules are gone."
Which claim about digestion is incorrect, based on the idea that digestion breaks down and rearranges food molecules (not destroys them)?
Answer: Student 2's claim is incorrect because digestion breaks down and rearranges food molecules; they are not destroyed.
This question focuses on identifying misconceptions about modeling food breakdown. Digestion involves breaking large food molecules into smaller component molecules through enzymatic action. These smaller molecules retain their atoms but can be rearranged into new molecular structures that the organism needs. Models of digestion should show this conservation of matter—atoms are neither created nor destroyed. Student 2's claim that molecules are "destroyed" represents a common misconception that confuses breaking molecular bonds with eliminating matter entirely. Student 1 correctly describes the process where breakdown enables rearrangement. Understanding that digestion reorganizes matter rather than destroying it helps explain how organisms convert food into body structures.
- A student's model shows a sandwich entering an organism. The model then shows the sandwich broken into smaller molecules, and later shows those smaller molecules rearranged into molecules that become part of the organism's body. Which piece of evidence from the model best supports the idea that molecules are rearranged, not destroyed, during digestion?
Reminder: digestion breaks down and rearranges food molecules.
Answer: The model shows the same smaller molecules after breakdown being used again in a different arrangement to make new molecules in the organism.
The core skill in modeling food breakdown is identifying evidence in models that supports molecular rearrangement during digestion. Digestion breaks food into smaller molecules, such as breaking a sandwich into basic nutrients through digestive juices. These smaller molecules are rearranged into different molecules for the organism's use, ensuring no matter is destroyed. Models depict this by showing the progression from intact food to broken-down pieces that are then reassembled into body parts. A misconception is that digestion only physically reduces size without chemical changes, but models prove rearrangement occurs. Breaking down food provides cells with raw materials they can use directly. Overall, this makes food's matter usable, promoting the organism's health and development.
- A class compares two before-and-after digestion models.
Model X: Food enters the organism → food is broken down into smaller molecules → smaller molecules are rearranged into different molecules.
Model Y: Food enters the organism → food is broken into smaller chunks only.
Which statement about food breakdown is supported by evidence from these models?
Answer: Model X better represents digestion because it includes both being broken down and rearranged into different molecules.
Modeling food breakdown requires showing both breaking down AND rearrangement to accurately represent digestion. During digestion, food molecules are broken down into smaller pieces and then these pieces are rearranged into different molecules the organism can use. Model X correctly shows both processes, while Model Y only shows physical breaking without the crucial rearrangement step. Accurate models must include the chemical transformation of molecules, not just size reduction. The misconception that physical breaking alone represents digestion misses the essential chemical changes. Breaking down and rearranging food molecules enables organisms to transform diverse foods into the specific molecules their cells need for all life processes.
- A student says: "In my model, digestion breaks down food molecules, but it does not rearrange them. The smaller pieces are exactly the same kinds of molecules as before." Which evidence would best show that this student's model is missing an important part of digestion (broken down and rearranged), based on a before-and-after comparison?
Answer: The after part should show new molecules made from the smaller pieces, showing rearrangement rather than only breaking apart.
Modeling food breakdown completely requires showing both breaking down AND rearrangement of molecules. During digestion, food molecules are first broken down into smaller pieces by digestive enzymes. However, these smaller pieces don't remain as miniature versions of the original molecules - they are rearranged into entirely different molecules that cells can use. A model showing only breaking apart misses the crucial rearrangement step where new molecules are formed. The misconception that digestion is only about making things smaller ignores the chemical transformations that occur. Breaking down food into rearranged molecules allows organisms to build the specific compounds their cells need for life processes.
- A student is checking a classmate's model for errors. The classmate's model shows: food entering an organism; the food breaking into smaller molecules; then an arrow labeled "digestion" pointing to an empty space with the label "molecules destroyed."
Which claim about digestion is incorrect, based on the model idea that digestion breaks down and rearranges food molecules and the evidence needed in a before-and-after comparison?
Answer: Digestion destroys the food molecules so they no longer exist as matter inside the organism.
The core skill in modeling food breakdown is checking models for errors and identifying incorrect claims about digestion. Digestion breaks food into smaller molecules, using enzymes to disassemble food structures. Crucially, these molecules are rearranged, not destroyed, to form new substances within the organism. Models should show before-and-after comparisons to provide evidence of this non-destructive change. A misconception is that digestion eliminates molecules entirely, but proper models reveal their persistence. Breaking down food prepares materials for cellular rearrangement and use. In essence, this process makes food's matter functional for the organism's ongoing needs.
- A student writes three statements about a model of digestion that shows: food enters a mouse → food is broken into smaller molecules → smaller molecules are rearranged into new molecules in the mouse. Digestion breaks down and rearranges food molecules. Which statement about food breakdown is supported by evidence from the model?
Answer: Food molecules are rearranged into new molecules in the mouse after being broken down into smaller molecules.
The core skill in middle-school life science is modeling how food is broken down during digestion to provide usable materials for organisms. Digestion breaks food into smaller molecules through mechanical and chemical processes in the mouth, stomach, and intestines. These molecules are rearranged into new forms, not destroyed, conserving matter as they become part of the body's tissues or energy sources. Models illustrate this change by showing before-and-after representations, such as large food particles dividing into smaller ones that then combine differently inside the organism. A common misconception is that food disappears or turns directly into energy, but actually, its atoms are repurposed without loss of matter. Breaking down food allows organisms to absorb nutrients efficiently, making essential building blocks available for growth and repair. Ultimately, this process ensures that cells can use rearranged molecules for functions like building muscles or producing energy.
- A student made a simplified before-and-after model of digestion:
Before: A large food molecule enters an organism.
After: The model shows many smaller molecules inside the organism, and later shows those same smaller molecules rearranged into a new molecule labeled "part of the organism."
Which statement about food breakdown is supported by the evidence in this model?
Reminder: digestion breaks down and rearranges food molecules.
Answer: Food molecules are rearranged into new molecules that can become part of the organism after they are broken into smaller molecules.
The core skill in modeling food breakdown is interpreting simplified before-and-after models to support statements about molecular changes. Digestion breaks food into smaller molecules, simplifying complex foods into basic units through bodily processes. These units are rearranged into new molecules that become part of the organism, conserving matter rather than destroying it. Models represent this by showing large molecules transforming into smaller ones that are reorganized. A misconception is that digestion creates new matter, but models demonstrate it's just reconfiguration. Breaking down food makes its components available for cellular use. This underscores how digestion allows organisms to incorporate external materials into their bodies.
