eby sngtas an energy (elecuo) source 16. Synthesis of ATP by oxidative phosphorylation is a seriously endergonic reaction. the immediate reservoir of stored energy that drives this process? A, the electron transport chain B. oxygen C. proton gradient or energized membrane D. NADH+ H’ and FADH2 E. glucose 17. Based on the energy diagram to the right, Which equation best represents the reaction? A+B 0 A. A+B C+D B. C+D AB C. AB D. CD CD AB Progress of the Reaction 18. Which of the following is the correct Keq for the above reaction? A+IB] C. Keq [CLID D. Keq [AIBI E. Can’t tell because it is not written in the proper form of an equation. C]+ID] A] [B] C] [D] 19. From the diagram in #16, which letter best represents the change in free energy between the reactants and the product? A. a B.b C. c D. dE e H O-H HO CH он The following scenario is for questions 13-15. You are a new PhD student in environmental science. During a previous field season, you isolated two different microbes from groundwater samples in Davis, CA and named them UCD-1 and UCD-3. Redox Couple 13. You start by comparing various aspects of Co oucose E, (v) -0.50 their growth capabilities. UCD-1 is able to grow without oxygen, but UCD-3 cannot. Which of 2HH, (-0.42) 2e the following hypotheses are reasonable, given this information? А.UCD 3 isaphotosynthetic microbe and NADYNADH(032)2e needs oxygen to grow B. UCD-1 is a bacterium that may use Nitrate or sm S(-0 28)20 Nitrite as an electron acceptor in the absence oxygen. 040 CO Jmethanol (-0.38) 6e — –o.30 COJacetate (-0 28) 8e -0.20 So HS (-0.22) 8e -0.10 c. UCD-3 is a bacterium which may ferment in FAD FADH-0 22) 2 the absence of oxygen. D. B and C E. A, B and C pyruvateMactate (-0.19) 2e 14. You notice that UCD-1 can grow on Hydrogen gas in the presence of Fumarate and tumarate/succinate (+0.03)2e.20 produces Succinate as a result. Using the redox eytochrome b (+0 035) 1e tower to the left, what is the ratio of hydrogen used compared to net ATP produced in this Ubiquinone(0.11)2e organism? Assume that a AE of 0.2 is required Fe/Fe (+0.2) 1e (pH 7) to produce 2 ATP A. No ATP can be produced B. a ratio of 1 Hydrogen gas (H2) to 1 ATPCytochrome a0.39) 1e C. a ratio of 1 Hydrogen gas (H2) to 2 ATP N,NO, 0.42)2e0.60 D. a ratio of 1 Hydrogen gas (H2) to 4 ATP E. a ratio of 1 Hydrogen gas (H2) to 6 ATP +0.30 +0.40 0.50 NOJEN,(+0.74) S 0.80 Fe/Fe (+0.76) e. (pH 2) /H,O (0 82)2e +0.90