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Pyruvate Oxidation and Electron Carriers
Grade Level
AP Biology
APB.198 Pyruvate Oxidation and Electron Carriers
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A student observes CO2, NADH, and FADH2 production after adding pyruvate to active mitochondria. Which conclusion is best justified?
A
Only pyruvate oxidation is active, because it directly produces all FADH2 from pyruvate.
B
Both pyruvate oxidation and the citric acid cycle are active, because pyruvate oxidation supplies CO2 and NADH and the cycle supplies additional CO2, NADH, and FADH2.
C
Only the electron transport chain is active, because it releases CO2 when NADH is oxidized.
D
Only glycolysis is active, because pyruvate addition prevents acetyl-CoA formation.
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