Why does NADH produce more energy than FADH2?
a. FADH2 donates electrons to protein complex III as opposed to complex II.
b. FADH2 requires more ATP to produce it and gives more energy back.
c. NADH and FADH2 are synthesized in different steps of cellular respiration.
d. NADH has a high free energy and can be oxidized more readily than FADH2.
e. NADH supplies fewer electrons that are of a higher energy state than FADH2.
ANSWER: d
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