PracticeExam4

A if k eq is greater than 1 and g is negative b if k

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a. If K eq is greater than 1 and G’° is negative. b. If K eq is 0 and G’° is negative. c. If K eq is negative and G’° is negative. d. If K eq is less than 1 and G’° is positive. 7. Which of the following has a thioester bond? a. Phosphoenolpyruvate. b. ATP. c. phosphocreatine. d. acetyl-CoA. e. NADH. 8. Which of the following carbon-containing molecules is most fully oxidized? a. carbon monoxide. b. carbon dioxide. c. methane. d. ethanol. e. pyruvate. 9. Electrons can be transferred from one molecule (electron donor) to another molecule (electron acceptor) by all of the following ways except: a. as a hydride ion. b. directly as an electron. c. as a proton. d. as a hydrogen atom. e. none of the above. 10. Below are the standard reduction potentials (E’°) for two conjugate redox pairs: Pyruvate-/lactate- E’° = –0.185v NAD+/NADH E’° = –0.320v Which of the following is true? a. The pyruvate/lactate conjugate redox pair has a greater tendency to lose electrons than the NAD+/NADH redox pair. b. Pyruvate has a greater affinity for electrons than NAD+. c. NAD+ is a reducing agent. d. Under standard conditions, NAD+ is more likely to be converted to NADH, than pyruvate is to be converted to lactate. e. none of the above.
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11. When the Keq of a reaction is equal to one, then the G, in kJ/mole is (this is a thought problem; it does not require R, T, ö or any other constants): a. 10. b. 1.0. c. 0. d. -1. e. - 10. Some standard E’ o values in volts for half cells are: NAD + /NADH -0.32 v Fumarate/Succinate 0.03 v FAD/FADH 2 -0.22 v Ferredoxin +3 /Ferredoxin +2 -0.43 v Cytochrome-a 0.29 v Oxaloacetate/Malate -0.17 v Cytochrome-c 0.25 ½ O 2 /water 0.82 v 12. From the information above, which molecule can reduce NAD + ? a. oxygen. b. fumarate. c. succinate. d. ferredoxin. e. cytochrome-c.
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a If K eq is greater than 1 and G is negative b If K eq is...

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