Unit 3 Cellular Energetics AP Biology

How can photosynthesis be related to cellular respiration?

• What's produced (made) by one is needed (the reactants) for the other
• They both produce the same products
• They both have the same reactants (need the same things)
• These 2 processes have nothing in common

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The reactants of photosynthesis are

• sugar and water.
• sugar and oxygen.
• carbon dioxide, light and water.
• carbon dioxide and oxygen.

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Enzymes are

• proteins that function as catalysts

• broken down in reactions that require energy input

• used up in chemical reactions.

• not needed for catabolic reactions

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Succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the ratio of succinate to malonic acid reduces the inhibitory effect of malonic acid. What is malonic acid's role with respect to succinate dehydrogenase?

• It is a competitive inhibitor.
• It is an allosteric regulator.
• It is able to bind to succinate.
• It blocks the binding of fumarate.

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Which of the following is true for anabolic pathways?

• they do not depend on enzymes
• they are usually spontaneous chemical reactions
• they consume energy to build polymers from monomers
• They release energy as they degrade polymers to monomers

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The mechanism by which the end product of a metabolic pathway inhibits an earlier step in the pathway is called ___________

• metabolic inhibition
• feedback inhibition
• irreversible inhibition
• allosteric regulation

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A degradative process such as cellular respiration can also be known as...

• catabolic pathway

• kinetic pathway

• endergonic pathway

• anabolic pathway

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ATP is called a cell’s “energy currency” because

• ATP catalyzes all metabolic reactions.
• most of the energy that drives metabolism is supplied by ATP.
• glucose is made of ATP.
• ATP allows one organelle to be exchanged for another between cells.

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Energy is released from ATP when

• a phosphate group is added
• adenine bonds to ribose
• ATP is exposed to sunlight
• a phosphate group is removed

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Which best describes how the shape of an enzyme affects its function?

• It determines the specific reaction it will catalyze
• It determines the raw products needed for the reaction
• It determines whether a reaction will be slowed or sped up
• It determines the products that will result from the reaction