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exam3_2009_solutions - BIOL 4087 Section 3 Fall 2009 Exam 3...

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1 BIOL 4087 Section 3 Fall 2009 Exam 3 Nov 10 2009 Part 1: Multiple Choice. Pick the best answer: 5 points each 1. Which of the following is true of phosphofructokinase? a) ATP binds to the catalytic site b) ATP binds to the allosteric site c) It is most active when the ratio of AMP to ATP is high d) All of the above 2. Which two of the following are true of the citric acid cycle? a) It generates electrons that are shuttled into the pathway for oxidative phosphorylation b) It generates more ATP molecules than glycolysis and oxidative phophorylation combined c) It has no connection with any other metabolic pathway d) One or more enzymes containing iron-sulfur cluster proteins participate in reactions within the pathway 3. In the respiratory chain (during oxidative phosphorylation), which one of the following is NOT true a) Electrons are transported using the activated carriers ubiquinone and cytochrome c. b) Electrons flow from centers of high redox potential to lower (or negative) redox potential c) Electrons flow from centers of low redox potential to higher (or more positive) redox potential d) Electrons flow between heme and copper clusters in Complex IV (cytochrome c oxidase) 4. The equilibrium ratio of phosphoenolpyruvate to pyruvate (below) under standard conditions (temperature = 298 K) when [ATP]/[ADP] = 100 is closest to a) 3.06 X 10 -6 b) 3.06 X 10 -4 c) 3.06 X 10 -2 d) 100
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2 5. Which one of the following reactions proceed to the right when the reactants are initially present in equimolar amounts? a) ATP + creatine creatine phosphate + ADP b) glycerol 3-phosphate + ADP ATP + glycerol c) ATP + pyruvate phosphoenolpyruvate + ADP d) ATP + glucose glucose 6-phosphate + ADP 6. Three glucose molecules are broken down through glycolysis to produce a) 3 GTP molecules and 3 pyruvate molecules b) 1 ATP molecule and 3 glycogens c) 6 ATP molecules and 6 pyruvates d) 2 GTP molecules and hexokinase 7. Which of the following mechanisms is used to regulate the balance between glycolysis and gluconeogenesis? a)
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exam3_2009_solutions - BIOL 4087 Section 3 Fall 2009 Exam 3...

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