Apentix/AP Biology/Unit 3: Cellular Energetics/Question

AP Biologyeasymcq1 pt

One turn of the Krebs cycle processes a single acetyl-CoA. Which set of products leaves that turn?

A.Two CO2, two FADH2, and four GTP

B.No CO2 is released because oxaloacetate is regenerated intact.

C.Two CO2, three NADH, one FADH2, and one GTP

D.Three CO2, three NADH, and no phosphorylated product

Explanation

Core Concept

A single turn associated with one acetyl-CoA yields two CO2, three NADH, one FADH2, and one GTP/ATP equivalent. Do not say that the two incoming acetyl carbons themselves leave as those two CO2 during the same turn; isotope-tracing logic shows that they generally remain in intermediates through the first turn and are released later.

Correct Answer

CTwo CO2, three NADH, one FADH2, and one GTP

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