Urea cycle: 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 · Urea cycle

Sample item

What is toxic when elevated in urea-cycle defects?

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

The answer and the reasoning

B. Ammonia

This item reviews Urea cycle; Ammonia is the best answer because it directly matches the biochemical or pathological mechanism described.

Option by option

  • A. Sodium

    Sodium is unsupported by the key finding.

  • B. Ammonia (correct)

    Correct. Ammonia fits the defining feature.

  • C. Glucose

    Glucose is plausible but not the best answer.

  • D. Bilirubin

    Bilirubin does not fit the stated 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, Ammonia. This item reviews Urea cycle; Ammonia is the best answer because it directly matches the biochemical or pathological mechanism described.

Why is "Sodium" not the answer?

Sodium is unsupported by the key finding.

Why is "Glucose" not the answer?

Glucose is plausible but not the best answer.

Why is "Bilirubin" not the answer?

Bilirubin does not fit the stated mechanism.

What concept does this question test?

It tests Urea cycle in Biochemistry. The correct option holds because: Correct. Ammonia fits the defining 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 Urea cycle?

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.