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BCHM461S98-x1 - Biochemistry 461 Section I Exam#1 Prof...

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Biochemistry 461 Your Printed Name: Section I February 24, 1998 Your SS#: Exam #1 Prof. Jason D. Kahn Your Signature: You have 80 minutes for this exam. Exams written in pencil or erasable ink will not be re-graded under any circumstances. Explanations should be concise, a couple of sentences. You will need a calculator for this exam, and no other study aids or materials are permitted. Possibly Useful Information: K a = [H + ][A - ] / [HA] for the dissociation of HA, so pH = pK a + log ([A - ] / [HA]) K w = 10 -14 = [HO - ][H + ] RT = 2476 J/mole today D G = D ¢ + RTlnQ, where Q has the form of an equilibrium constant D G = - n F D E, where F = 96500 J/(V•mole), n = number of electrons transferred D ¢ = -30.5 kJ/mole for ATP 4- + H 2 O ADP 3- + HPO 4 2- + H + Redox half-reactions: NAD + + 2H + + 2 e - NADH + H + E ° ¢ = –0.315 V SO 4 2- (sulfate) + 2H + + 2 e - SO 3 2- + H 2 O E ° ¢ = 0.48 V NO 3 - (nitrate) + 2H + + 2 e - NO 2 2- + H 2 O E ° ¢ = 0.42 V 1 / 2 O 2 + 2H + + 2 e - H 2 O E ° ¢ = 0.815 V
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2 1. (23 pts) Redox reactions and bioenergetics. We make most of our ATP from the redox reaction below, in a process called oxidative phosphorylation: NADH + H + + 1 / 2 O 2 NAD + + H 2 O (a; 8 pts) Calculate D ¢ , D ¢ , and K eq for this reaction. How many ATPs could be synthesized from ADP and P i by coupling to this reaction (per NADH oxidized)? (b; 3 pts) Oxidative phosphorylation provide examples of three ways in which biological systems store energy. List them (in general).
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3 (c; 8 pts) In the sediments at the bottoms of lakes, there is very little oxygen. Anaerobic bacteria in the
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