Oxidative phosphorylation: practice question

A Biochemistry question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Biochemistry · Oxidative phosphorylation

Sample item

What is the terminal electron acceptor in aerobic respiration?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

B. Oxygen

The defining Oxidative phosphorylation relationship supports Oxygen; it is the option that most directly explains the biochemical pathway or pathological process in the stem.

Option by option

  • A. NADH

    NADH is relevant in a different context but is not supported here.

  • B. Oxygen (correct)

    Correct. Oxygen is the appropriate conclusion from the key feature.

  • C. Pyruvate

    Pyruvate does not account for the central finding in this item.

  • D. Carbon dioxide

    Carbon dioxide does not match the stated oxidative phosphorylation mechanism.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

More Biochemistry questions

Questions about this Biochemistry question

What is the answer to this Biochemistry question?

The best answer is B, Oxygen. The defining Oxidative phosphorylation relationship supports Oxygen; it is the option that most directly explains the biochemical pathway or pathological process in the stem.

Why is "NADH" not the answer?

NADH is relevant in a different context but is not supported here.

Why is "Pyruvate" not the answer?

Pyruvate does not account for the central finding in this item.

Why is "Carbon dioxide" not the answer?

Carbon dioxide does not match the stated oxidative phosphorylation mechanism.

What concept does this question test?

It tests Oxidative phosphorylation in Biochemistry. The correct option holds because: Correct. Oxygen is the appropriate conclusion from the key feature.

How hard is this question?

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.

How should I study Oxidative phosphorylation?

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.

Is this a real NEET PG question?

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.