Reduction Potentials in the Electron Transport Chain
REFLECT AND APPLY Comment on the fact that the reduction of pyruvate to lactate, catalyzed by lactate dehydrogenase, is strongly exergonic (recall this from Chapter 15), even though the standard free-energy change for the half reaction
Pyruvate+2H+ + 2e− → Lactate
is positive (ΔG°' = 36.2 kJ mol-1 = 8.8 kcal mol-1), indicating an endergonic reaction.
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