AP Biologymediummcq1 pt

During complete aerobic respiration of one glucose molecule, at which stages is carbon dioxide actually released?

A.Pyruvate oxidation and the citric acid cycle, where carboxyl groups are stripped from organic acids
B.Glycolysis and pyruvate oxidation, which jointly dismantle the carbon skeleton
C.The citric acid cycle and oxidative phosphorylation, where reduced carriers unload their cargo
D.Glycolysis alone, since splitting a six-carbon sugar necessarily sheds three carbons

Explanation

Core Concept

During complete aerobic oxidation of glucose, carbon dioxide is released during pyruvate oxidation and during the citric acid cycle. The important AP-core idea is that carbon from glucose-derived molecules is oxidized and released as CO2. Exact per-glucose bookkeeping can be useful enrichment but should not be required for default AP-core practice.

Correct Answer

APyruvate oxidation and the citric acid cycle, where carboxyl groups are stripped from organic acids

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