Aerobic means \"proceeding in the presence of O2.\" Aerobic processes include: t

Question

Aerobic means "proceeding in the presence of O2." Aerobic processes include: the pyruvate dehydrogenase reaction; citric acid cycle; oxidative phosphorylation. But only one of these processes requires O2! (That, of course, is electron transport -- the "ox" of "oxphos.")

Why does aerobic catabolism slow or stop in the presence of little or no oxygen?

A. A low ADP level in mitochondria results in a slowing of ATP synthesis.

B. Because all of the processes listed in the question use O2 directly.

C. Because both eletron transport and pyruvate dehydrogenase use O2 directly.

D. Because ATP synthesis in oxidative phosphorylation (by ATP synthase) uses O2 directly.

Explanation / Answer

The aerobic proceeses are slow because,

A. A low ADP level in mitochondria results in a slowing of ATP synthesis.

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