The table provides the standard reduction potential, E'•, for relevant half-cell reactions. Half-reaction E'° (V) Oxaloacetate2- + 2 H+ + 2e- malate- -0.166 Pyruvate + 2H+ + 2e lactate -0.185 Acetaldehyde + 2H+ + 2e- ethanol -0.197 NAD+ + H+ + 2e--> NADH -0.320 NADP+ + + + 2e- NADPH -0.324 Acetoacetate + 2H+ + 2e- - B-hydroxybutyrate -0.346 Which of the reactions listed would proceed in the direction shown, under standard conditions, in the presence of the appropriate enzymes? Acetaldehyde + succinate — ethanol + fumerate Pyruvate + NADH + H+ lactate + NAD+ Pyruvate + B-hydroxybutyrate lactate + acetoacetate Malate + pyruvate oxaloacetate + lactate Malate + NADP oxaloacetate + NADH + H+ Acetoacetate + NADH + H+ B-hydroxybutyrate + NAD+
