- The citric acid cycle.Starting with citrate, which of the following combinations of products would result from three acetyl CoA molecules entering the citric acid cycle?
A) 1 ATP, 2 CO₂, 3 NADH, and 1 FADH₂
B) 3 ATP, 3 CO₂, 3 NADH, and 3 FADH₂
C) 3 ATP, 6 CO₂, 9 NADH, and 3 FADH₂
D) 6 ATP, 6 CO₂, 3 NADH, and 12 FADH₂

Question

- The citric acid cycle.Starting with citrate, which of the following combinations of products would result from three acetyl CoA molecules entering the citric acid cycle?
A) 1 ATP, 2 CO₂, 3 NADH, and 1 FADH₂ 
B) 3 ATP, 3 CO₂, 3 NADH, and 3 FADH₂ 
C) 3 ATP, 6 CO₂, 9 NADH, and 3 FADH₂ 
D) 6 ATP, 6 CO₂, 3 NADH, and 12 FADH₂

Quizplus · Accepted Answer

Each acetyl CoA molecule entering the citric acid cycle produces 1 ATP, 2 CO₂, 3 NADH, and 1 FADH₂. Therefore, three acetyl CoA molecules entering the cycle would produce:
3 ATP (3 acetyl CoA x 1 ATP/acetyl CoA)
6 CO₂ (3 acetyl CoA x 2 CO₂/acetyl CoA)
9 NADH (3 acetyl CoA x 3 NADH/acetyl CoA)
3 FADH₂ (3 acetyl CoA x 1 FADH₂/acetyl CoA)
Therefore, the only answer choice that matches this combination of products is C.

- the Citric Acid Cycle