The electrons that are present in NADH and FADH2 are very high energy and theoretically sufficient to produce ATP alone. Why then have biological systems evolved in a way to use the various steps of cellular respiration to produce ATP?
a. It would be less efficient to produce ATP directly from NADH and FADH2.
b. There are insufficient amounts of ADP to phosphorylate and make ATP.
c. All living organisms must use oxygen and therefore must carry out cellular respiration.
d. The steps in respiration allow for a controlled release of energy in small increments.
e. Not all cells have NADH and FADH2 present in their cytoplasm.
D
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