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

Which poison inhibits cytochrome c oxidase?

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

The answer and the reasoning

B. Cyanide

This item reviews Oxidative phosphorylation; Cyanide is the best answer because it directly fits the mechanism or morphology described.

Option by option

  • A. Fluoride

    Fluoride does not match the key mechanism or pattern.

  • B. Cyanide (correct)

    Correct. Cyanide is supported by the defining finding.

  • C. Atropine

    Atropine is plausible but is not the best fit here.

  • D. Naloxone

    Naloxone is not supported by the stated finding.

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, Cyanide. This item reviews Oxidative phosphorylation; Cyanide is the best answer because it directly fits the mechanism or morphology described.

Why is "Fluoride" not the answer?

Fluoride does not match the key mechanism or pattern.

Why is "Atropine" not the answer?

Atropine is plausible but is not the best fit here.

Why is "Naloxone" not the answer?

Naloxone is not supported by the stated finding.

What concept does this question test?

It tests Oxidative phosphorylation in Biochemistry. The correct option holds because: Correct. Cyanide is supported by the defining finding.

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.