8. (Learning rgy that is used to convert ADP + Pi to ATP? A Energy transfers fro

Question

8. (Learning rgy that is used to convert ADP + Pi to ATP? A Energy transfers from electrons flowing through the electron transport system objective L62) During oxidative phosphorylation, what is the most direct No external source of energy is required because the reaction is exergonic energy transferred by substrate-level phosphorylation energy transferred by ATP synthase as it pumps hydrogen ions against their ent E energy transferred via ATP synthase by protons moving through the protein earning Objective 59) In the TCA cycle, a six-carbon compound is formed by the 9. (L combination of Acetyl CoA and (use the TCA diagram at the end of the exam) B. oxaloacetate C. malate citrate carbon dioxide 10. (Learnin g Objective 66) In cyclic photosynthesis, the photocenter is reduced by the electron used to power the electron transport chain. In noncyclic photosynthesis, the photocenter remains oxidized Solutions to this problem include: -A, absorption of another high-energy electron with a photon of light stripping of a low energy electron from a nearby electron donor stripping of a high-energy electron from a nearby electron donor ..the photocenter would need to be pulled from the membrane to become reduced. E. A or C are both correct answers 11. (Learning Objective 49) The following redox reaction is Menaquinone (red) + NAD+ Menaquinone (ox) + NADH Half reaction E(v) exergonic & spontaneous endergonic & spontaneous 0.32) 0.22 (-0.074) (+0.25) (+0.42) FAD-FADH2 c)endergonic & non-spontaneous exergonic & non-spontaneous (ax)fred) cytochiome c(oxtred) NO3 INO2 12. (Learning Objective 40, 62) The compound 2,4 dinitrophenol (DNP) was used as a diet aid in years past. It functions by causing proton leaks in membranes that maintain a respiratory proton gradient. In an aerobic cell treated with DNP you would expect to see an increase in the rate of all EXCEPT a)ATP synthesis B. Proton pumping by the electron transport chain C. Heat generation in the cell C. Oxygen utilization by the cell D. NADH oxidation by NADH dehydrogenase, a component of the ETC

Explanation / Answer

8)

The answer is E, NADH and FADH2 progress through ETC to, give electrons to complexes and this leads to a simultaneous transport of hydrogen ions to intermembrane space. Hydrogen ions flow across their gradient into the matrix rotating the ATP synthase and synthesizing ATP

9) The answer is B. Oxaloacetate and acetyl CoA react to form citrate.

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