Biology and Life Sciences

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GED Science › Biology and Life Sciences

Questions 1 - 10
1

Which of the following actions is performed by proteins?

Serving as biological catalysts

Storing genetic information

Providing energy for the body

Creating the structure of the cellular membrane

Explanation

Proteins have a variety of functions in the body, one of which is acting as biological catalysts. These specialized proteins are called enzymes and are used to facilitate all types of chemical reactions in organisms.

Storing genetic information is accomplished by nucleic acids, and energy is provided by carbohydrates. Lipids (or phospholipids to be specific) help create the plasma membrane structure.

2

Which of the following actions is performed by proteins?

Serving as biological catalysts

Storing genetic information

Providing energy for the body

Creating the structure of the cellular membrane

Explanation

Proteins have a variety of functions in the body, one of which is acting as biological catalysts. These specialized proteins are called enzymes and are used to facilitate all types of chemical reactions in organisms.

Storing genetic information is accomplished by nucleic acids, and energy is provided by carbohydrates. Lipids (or phospholipids to be specific) help create the plasma membrane structure.

3

Which of the following cells only contains a single copy of each chromosome?

Oocyte

Neuron

Lymphocyte

Erythrocyte

Explanation

The germ cells (eggs/oocytes and sperm) contain only one copy of each chromosome. This reduction in the amount of DNA occurs through meiosis. Most cells in the body contain two copies of each chromosome and are considered diploid. Since they only contain ne copy of each chromosome, germ cells are considered haploid.

Neurons and lymphocytes (white blood cells) contain two copies of each chromosome; they are diploid. Erythrocytes (red blood cells) do not have nuclei, and do not contain any genetic material.

4

Which of the following actions is performed by proteins?

Serving as biological catalysts

Storing genetic information

Providing energy for the body

Creating the structure of the cellular membrane

Explanation

Proteins have a variety of functions in the body, one of which is acting as biological catalysts. These specialized proteins are called enzymes and are used to facilitate all types of chemical reactions in organisms.

Storing genetic information is accomplished by nucleic acids, and energy is provided by carbohydrates. Lipids (or phospholipids to be specific) help create the plasma membrane structure.

5

Which of the following cells only contains a single copy of each chromosome?

Oocyte

Neuron

Lymphocyte

Erythrocyte

Explanation

The germ cells (eggs/oocytes and sperm) contain only one copy of each chromosome. This reduction in the amount of DNA occurs through meiosis. Most cells in the body contain two copies of each chromosome and are considered diploid. Since they only contain ne copy of each chromosome, germ cells are considered haploid.

Neurons and lymphocytes (white blood cells) contain two copies of each chromosome; they are diploid. Erythrocytes (red blood cells) do not have nuclei, and do not contain any genetic material.

6

Which of the following cells only contains a single copy of each chromosome?

Oocyte

Neuron

Lymphocyte

Erythrocyte

Explanation

The germ cells (eggs/oocytes and sperm) contain only one copy of each chromosome. This reduction in the amount of DNA occurs through meiosis. Most cells in the body contain two copies of each chromosome and are considered diploid. Since they only contain ne copy of each chromosome, germ cells are considered haploid.

Neurons and lymphocytes (white blood cells) contain two copies of each chromosome; they are diploid. Erythrocytes (red blood cells) do not have nuclei, and do not contain any genetic material.

7

Which of the following membrane transport mechanisms is not an active processes?

Diffusion

Endocytosis

Active transport

Phagocytosis

Pinocytosis

Explanation

Passive transport processes move ions or molecules across the plasmalemma without any energy expenditure by the cell whereas active transport processes involve the cell spending energy.

During diffusion a molecule moves from an area of high concentration to an area of low concentration. Movement is achieved following the concentration gradient and no energy is spent by cell.

8

Which of the following membrane transport mechanisms is not an active processes?

Diffusion

Endocytosis

Active transport

Phagocytosis

Pinocytosis

Explanation

Passive transport processes move ions or molecules across the plasmalemma without any energy expenditure by the cell whereas active transport processes involve the cell spending energy.

During diffusion a molecule moves from an area of high concentration to an area of low concentration. Movement is achieved following the concentration gradient and no energy is spent by cell.

9

Which of the following membrane transport mechanisms is not an active processes?

Diffusion

Endocytosis

Active transport

Phagocytosis

Pinocytosis

Explanation

Passive transport processes move ions or molecules across the plasmalemma without any energy expenditure by the cell whereas active transport processes involve the cell spending energy.

During diffusion a molecule moves from an area of high concentration to an area of low concentration. Movement is achieved following the concentration gradient and no energy is spent by cell.

10

Which of the following organelles is found in plant cells, but not in animal cells?

Chloroplast

Golgi body

Smooth endoplasmic reticulum

Mitochondria

Explanation

One of the primary differences between plant cells and animal cells is that plant cells must be able to undergo photosynthesis. Photosynthesis takes place in the chloroplasts, which contain the pigment chlorophyll. Chloroplasts are not found in animal cells, but are found in plant cells.

Both animal and plant cells contain Golgi bodies, smooth endoplasmic reticulum, and mitochondria.

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