Which of the following statements regarding the

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40. Which of the following statements regarding the mechanism of the proteasome is FALSE? A) Only proteins that are poly-ubiquitinated are degraded by the proteasome. B) The proteasome is a barrel-shaped structure. C) The proteasome contains hydrolytic enzymes that break peptide bonds. D) Proteins that are destined for the proteasome are ubiquitinated at Lys residues. E) The proteasome uses ATP hydrolysis to unfold the targeted protein. Version 3 Page 4
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41. Which of the following enzymes of the citric acid cycle would be inhibited by ATP? 42. Shown below (far left) is the Fischer projection of D -mannose. Which of the labeled structures below would be a proper representation of the Haworth projection of this molecule? 43. Which of the following can dispose of carbon atoms through the TCA cycle? 44. Which of the following statements regarding near-equilibrium reactions is TRUE? A) The Δ G values are always slightly less than zero. B) These reactions can easily be made favorable within the cell with a slight excess of substrates. C) These represent possible flux control points in metabolic pathways. D) These tend to be the slowest reactions of the pathway. E) Both B and D are true. 45. Which of the following are used to form polymers that serve as dedicated storage molecules? 46. Electrons that enter at Complex II translocate enough protons to make ~3 ATP. 47. Which of the following are TRUE regarding Complex I of the mitochondrial electron transport chain? 48. Which reaction(s) of the TCA cyle is (are) regulated by feedback inhibition? A) Step 1 E) A and B B) Step 2 F) B and C C) Step 3 G) A and D D) Step 4 H) A, C, and D
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