Multiple Choice
Per molecule of glucose (two turns of the citric acid cycle), what are the net products of the citric acid (Krebs) cycle, excluding ATP/GTP and reduced cofactors generated by pyruvate dehydrogenase?
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Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism
Citric Acid Cycle 1
Multiple Choice
Which stage of cellular respiration produces the greatest number of NADH molecules per glucose molecule?
A
Citric acid cycle (Krebs cycle)
B
Glycolysis
C
Pyruvate oxidation (conversion of pyruvate to acetyl-CoA)
D
Oxidative phosphorylation (electron transport chain and chemiosmosis)
Verified step by step guidance1
Identify the main stages of cellular respiration: Glycolysis, Pyruvate oxidation, Citric acid cycle (Krebs cycle), and Oxidative phosphorylation.
Recall that NADH is produced during Glycolysis, Pyruvate oxidation, and the Citric acid cycle, but not directly during Oxidative phosphorylation.
Determine the number of NADH molecules produced per glucose molecule in each stage: Glycolysis produces 2 NADH, Pyruvate oxidation produces 2 NADH (one per pyruvate, and there are two pyruvates per glucose), and the Citric acid cycle produces 6 NADH (three per acetyl-CoA, and two acetyl-CoA per glucose).
Compare these values to see which stage produces the greatest number of NADH molecules per glucose molecule.
Conclude that the Citric acid cycle produces the highest amount of NADH per glucose molecule based on the comparison.
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