A deep-space bioengineering team injects synthetic pyruvate labeled with carbon-14 at its carboxyl group into the matrix of isolated eukaryotic mitochondria powering an environmental life-support unit. Shortly after the fuel enters the pyruvate dehydrogenase complex, molecular sensors detect the immediate release of radioactive carbon dioxide gas alongside a newly formed two-carbon intermediate. Which molecular transformation directly accompanies this specific decarboxylation event during pyruvate oxidation?

A) Phosphorylation of ADP to produce ATP via substrate-level phosphorylation

B) Reduction of FAD to form FADH₂ while releasing free water molecules

C) Reduction of NAD⁺ to NADH coupled with the attachment of coenzyme A

D) Cleavage of citric acid to regenerate oxaloacetate inside the matrix

Pyruvate oxidation Original Scenario-Based Practice

Biology · Cellular Energetics · Biology · Cellular Respiration

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Cellular Energetics · Biology

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