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Exam II 2009 ANSWERS - BioSci 1000 exam II Schwacha page 1...

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BioSci 1000 exam II – Schwacha page 1 Name__________________________ Student number ________________ Exam II – Schwacha section 50 points total 11/3/09 1. Turn off and stow all electronic gizmos 2. Put away all incriminating study material and notes 3. Print your name on each page 4. Read each question carefully 5. Answer each question in ink only and write legibly, otherwise no regrade 6. Remember to sign the class list when you turn in your exam. 5. Good luck! Calculators are NOT allowed or required. _____________________________________________________________ Information that may or may not be helpful Boltzmann Constant, k = 1.381 X 10 -23 J/K Avogadro’s number, N =6.022 X 10 23 mol -1 Faraday’s constant, F = 96.48 kJ V -1 . mol -1 Gas constant = R=8.315 j/mol . K 25 o c = 298 K ln10 = 2.3; log 10=1; log 1 = 0 Murphy’s law of thermodynamics: Things get worse under pressure Dobie's Dogma: If you are not thoroughly confused, you have not been thoroughly informed (educated
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BioSci 1000 exam II – Schwacha page 2 Name__________________________ Multiple choice - Circle the best answer 1. For the following reaction, Δ G' ° = 29.7 kJ/mol. L-Malate + NAD + -> oxaloacetate + NADH + H + The reaction as written (2 pts): A) can never occur in a cell. B) can only occur in a cell if it is coupled to another reaction for which Δ G' ° is positive. C) can only occur in a cell in which NADH is converted to NAD + by electron transport. D) may occur in cells at certain concentrations of substrate and product. E) would always proceed at a very slow rate 2. The standard reduction potentials ( E' °) for the following half reactions are given. α -ketoglutarate + CO 2 + H+ + 2e- + 2H + + 2e -> isocitrate E' ° = -0.38 V NAD + + H + + 2e -> NADH E' ° = –0.32 V If you mixed a-ketoglutarate, isocitrate, NAD + , and NADH 2 together, all at l M concentrations and in the presence of isocitrate dehydrogenase, which of the following would happen initially (2 pts)? A) α -ketoglutarate and isocitrate would become oxidized; NAD + and NADH would become reduced. B) Isocitrate would become oxidized, NAD + would become reduced. C) No reaction would occur because all reactants and products are already at their standard concentrations. D) α -ketoglutarate would become oxidized, NAD + would become reduced. E) α -ketoglutarate would become oxidized, NADH 2 would be unchanged because it is a cofactor.
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