Oxidative phosphorylation: practice question

The best answer is A, Proton gradient. Electron transport pumps protons across the inner mitochondrial membrane, and their return down this electrochemical gradient drives ATP synthase.

Glucose is metabolized upstream and does not directly turn ATP synthase.

Carbon dioxide is a metabolic waste product, not the energy gradient.

Sodium gradient is not the main mitochondrial ATP synthase driver.

It tests Oxidative phosphorylation in Biochemistry. The correct option holds because: Correct: proton motive force powers mitochondrial ATP synthase.

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

Build one table of enzyme deficiency, disease, inheritance and key finding, then revise it by spaced recall. Then use the flashcards and the other Biochemistry questions on this site to test what stuck.

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.