Keystone Homework #7

Genetic mutations can cause chloroplasts in leaf cells to lack pigment and appear pale yellow . Which statement describes how a plant is most immediately affected by the presence of these genetic mutations?

• The amount of light energy transformed into chemical energy is reduced

• The ability to absorb minerals is reduced .

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An organism carries out both photosynthesis and cellular respiration . Which statement describes a difference between these two processes?

• Only cellular respiration creates chemical energy .

• Only photosynthesis changes light energy into chemical energy .

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A cell in the leaf of a green plant performs both photosynthesis and cellular respiration, often at the same time . Which statement best describes how these processes are related to each other?

• Products of one process are used as some of the reactants for the other process .

• Both processes require energy directly from the Sun .

• Both processes produce carbon dioxide .

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Each cell in the human body contains thousands of different enzymes responsible for regulating reactions within the cell. Which statement explains why a single enzyme is unable to regulate a variety of reactions?

• The binding of a product and an enzyme is specific.

• The binding of a substrate and an enzyme is specific.

A scientist observed that during the course of a chemical reaction the number of ATP molecules was reduced. What did the scientist most likely learn from the observation?

• The reaction consumed water.

• The reaction caused an output of energy.

• The reaction required an input of energy

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Which statement best describes how channel and carrier proteins in the plasma membrane are similar?

• Both allow for the flow of molecules into and out of a cell.

• Both directly connect the membrane to the nucleus of a cell.

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Which statement best explains why cellular respiration in plants and other organisms is dependent on photosynthesis?

• Photosynthesis provides the materials that fuel cellular respiration.

• Photosynthesis is one of the final steps in cellular respiration.

• Photosynthesis absorbs materials that are catalyzed during cellular respiration.

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Which two statements correctly describe one similarity and one difference between cellular respiration and photosynthesis? A. statements 1 and 2 B. statements 1 and 4

• statements 1 and 2

• statements 1 and 4

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Muscle cells have a comparatively large number of mitochondria . Which action does this characteristic allow muscle cells to accomplish?

• rapidly release chemical energy for use

• rapidly convert carbohydrates into lipids

• reduce oxygen demand when releasing stored energy

• reduce oxygen demand when releasing stored energy

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