MCAT Biochemistry Question 144: Answer and Explanation

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Question: 144

9. Which of the following correctly shows the amount of ATP produced from the given high-energy carriers?

A. FADH₂ → 1 ATP
B. FADH₂ → 1.5 ATP
C. NADH → 3 ATP
D. NADH → 3.5 ATP

Correct Answer: B

Explanation:

During oxidative phosphorylation, energy is harvested from the energy carriers FADH₂ and NADH in order to form ATP. One molecule of mitochondrial FADH₂ is oxidized to produce 1.5 molecules of ATP. Similarly, one molecule of mitochondrial NADH is oxidized to produce 2.5 molecules of ATP in the electron transport chain.

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