In the tca cycle the production of fumarate

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50. In the TCA cycle, the production of fumarate represents a(n) A) reduction B) oxidation C) carboxylation D) decarboxylation E) dehydration 51. Which of the following statements regarding the mechanism of the proteasome is FALSE? Section III: 18 points (3 points each) 52. Place the following steps of the pyruvate dehydrogenase complex in the correct order: 53. Which of the following statements about glycogen and glucose metabolism in skeletal muscle is correct? 54. In a molecule of glycogen containing 20 branch points, there is (are) ____ reducing ends on the polymer. A) 0 B) 1 C) 19 D) 20 E) 21 55. Arsenate is a phosphate analog and can replace phosphate in the glyceraldehyde-3-phosphate dehydrogenase reaction. What would be the expected effect on the ATP yield in glycolysis in the presence of arsenate? 56. Citrate is an allosteric effector of phosphofructokinase. Would it be likely to active or inhibit this enzyme? A) activate B) inhibit Version 2 Page 6
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57. How many protons could theoretically be pumped (under standard state conditions) by Complex III per mol of coenzyme Q (CoQ) oxidized, considering the following information? (HINT: Watch your stoichiometry!) CoQ + 2H + + 2 e - CoQH 2 E ° 0.040 V Cytochrome c (Fe 3+ ) + e - cytochrome c (Fe 2+ ) E ° 0.270 V H + (outside matrix) H + (inside matrix) Δ G -20 kJ/mol to translocate 1 proton Version 2 Page 7
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Answer Key Version 2 Page 8
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54. B 55. A 56. B 57. B Version 2 Page 9
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