BCHM461S98-x1

BCHM461S98-x1 - Biochemistry 461 Section I February 24,...

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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 G ¢ + 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 G ¢ = -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 E ¢ , D G ¢ , 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 mud can use sulfate or nitrate as electron acceptors instead of oxygen. Write the balanced chemical
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This note was uploaded on 10/17/2009 for the course BIOCHEM 461 taught by Professor Kahn during the Fall '98 term at ASU.

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BCHM461S98-x1 - Biochemistry 461 Section I February 24,...

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