MCAT Biochemistry Question 150: Answer and Explanation

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Question: 150

15. Which of the following directly provides the energy needed to form ATP in the mitochondrion?

A. Electron transfer in the electron transport chain
B. An electrochemical proton gradient
C. Oxidation of acetyl-CoA
D. β-Oxidation of fatty acids

Correct Answer: B

Explanation:

While all of the other answers contribute to energy production, it is the electrochemical gradient (proton-motive force) that directly drives the phosphorylation of ATP by the F₁ portion of ATP synthase.

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