A. Match each equation in column A with the corresponding standard redox potential in column B
Column A Column B
1. H2O ?½O2 + 2H+ + 2 e– A. +30 mV
2. reduced ubiquinone ? oxidized ubiquinone + 2H+ + 2 e– B. +820 mV
3. NADH ? NAD+ + H+ + 2 e– C. +230 mV
4. reduced cytochrome c? oxidized cytochrome c + e– D.–320 mV
B. How do these standard redox potentials support our understanding of the stepwise electron transfers that occur in the electron-transport chain?
C. Why would it not be advantageous for living systems to evolve a mechanism for the direct transfer of electrons from NADH to O2?
A. 1—B; 2—A; 3—D; 4—C
B. Each successive member of the electron-transport chain is a better electron acceptor, which permits a unidirectional series of electron transfers until reaching O2, which is the best electron acceptor and the final destination of the electrons, forming water as oxygen is consumed.
C. If NADH directly donated electrons to O2, a large amount of energy would be released as heat and lost, rather than used as a way for the cell to generate chemical energy in the form of ATP.
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