172Practice+Questions+Exam+2

172Practice+Questions+Exam+2 - Practices Questions These...

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Practices Questions These are from the lectures, for the most part.
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Glycolysis is regulated in response to the amount of ATP in the cell. Specifically, high levels of ATP will regulate the activity of phosphofructokinase, a key enzyme in glycolysis. How does this regulation occur? A. ATP binds to the enzyme’s active site, increasing enzyme activity. B. ATP inhibits the synthesis of new enzyme molecules. C. ATP binds to the enzyme’s regulatory site, resulting in a conformational change that inhibits enzyme activity. D. ATP activates the production of new enzyme molecules.
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Exam Practice What kind of metabolic poison would most directly interfere with glycolysis? A. An agent that reacts with oxygen and depletes its concentration in the cell. B. An agent that binds to pyruvate and inactivates it. C. An agent that closely mimics the structure of glucose but is not metabolized. D. An agent that reacts with NADH and oxidizes it to NAD + . E. An agent that blocks the passage of electrons along the electron transport chain.
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If a H + ionophore (that makes the membranes fully permeable to protons) was added to mitochondria, which of the following would occur? A) ATP synthesis by oxidative phosphorylation would be inhibited. B) ATP synthesis by oxidative phosphorylation would be increased. C) Electron transport through the ETC would be shut down. D) ATP synthase would hydrolyze ATP to ADP + Pi.
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An athlete is running a marathon. Her muscles are using ATP faster than it can be produced by aerobic respiration. How does the runner continue the race? A. Her muscles fatigue and she has to stop. B. She has to breathe deeper to remove the CO 2 from her muscle cells. C. She should have carbohydrate-loaded the night before. D. Her muscle cells use lactic acid fermentation to continue producing ATP by substrate-level phosphorylation.
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Exam Practice The oxygen consumed during cellular respiration is involved directly in which process or event? A. glycolysis B. accepting electrons at the end of the electron transport chain C. the Krebs cycle D. the oxidation of pyruvate to acetyl CoA E. the phosphorylation of ADP to form ATP
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Photophosphorylation results when _____.
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This note was uploaded on 01/12/2011 for the course BIO 172 taught by Professor Clark during the Winter '08 term at University of Michigan.

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172Practice+Questions+Exam+2 - Practices Questions These...

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