Lec9_10_posted.pptx - Bio98 Lecture 9-10 Oxidation and...

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Bio98 Lecture 9-10 Oxidation and Reduction (Redox) And Electron Transport Chain
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NAD + + 2e- NADH Positive E: taker Negative E: giver For example Negative G needs positive E taker giver More positive Therefore,
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A Table of E 0 Good e taker Good e giver More positive Less positive
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NAD + pyruvate NADH + AcCoA e taker capable of oxidizing namely it can be reduced It has a more positive E 0 e giver capable of being oxidized It has a less positive E 0 This is more positive than -0.48 taker giver taker giver
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2.5 2.5 2.5 ADP ATP, 33 kJ/mol, 2.5 ATP = 82.5 kJ/mol 82.5/220 = 37.5 % 62.5 % used in transport (More details in Lec 10) taker giver
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Calculate: (A) the ∆E 0 for the reaction catalyzed by lactate dehydrogenase. (B) the ∆G 0 of this reaction. Faraday’s constant is 96.5. Answer (A) Lactate dehydrogenase: pyruvate + NADH lactate + NAD + The e giver is NADH, and NAD+ + 2e- NADH, E 0 = -0.32 The e taker is pyruvate, and pyruvate + 2e- lactate, E 0 = -0.19 More positive ∆E 0 = E 0 (taker) - E 0 (giver) = -0.19 – (-0.32) = 0.13 eV (B) ∆G 0 = -n*F* ∆E 0 =-2*96.5*0.13 = -25.09 kcal/mol Q&A For E calculation #1
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