Cellular Respiration

AP Biology· difficulty 3/5

The CO₂ released by aerobic cellular respiration originates primarily from

A
$Reduction of pyruvate to lactate during anaerobic fermentation$
B
$Hydrolysis of ATP molecules during the substrate-level phosphorylation$
C
$Oxidation of water at the terminal complex of the electron transport chain$
D
$Decarboxylation steps in pyruvate oxidation and the Krebs cycle$
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Explanation

Decarboxylation reactions strip CO₂ from glucose-derived intermediates one carbon at a time.

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