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

Which deficiency commonly causes hyperammonemia with low BUN?

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

The answer and the reasoning

C. Urea-cycle defect

This item reviews Urea cycle; Urea-cycle defect is the best answer because it directly fits the mechanism or morphology described.

Option by option

  • A. G6PD deficiency

    G6PD deficiency does not match the key mechanism or pattern.

  • B. Biotin deficiency

    Biotin deficiency is not supported by the stated finding.

  • C. Urea-cycle defect (correct)

    Correct. Urea-cycle defect is supported by the defining finding.

  • D. Lactase deficiency

    Lactase deficiency is plausible but is not the best fit here.

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 C, Urea-cycle defect. This item reviews Urea cycle; Urea-cycle defect is the best answer because it directly fits the mechanism or morphology described.

Why is "G6PD deficiency" not the answer?

G6PD deficiency does not match the key mechanism or pattern.

Why is "Biotin deficiency" not the answer?

Biotin deficiency is not supported by the stated finding.

Why is "Lactase deficiency" not the answer?

Lactase deficiency is plausible but is not the best fit here.

What concept does this question test?

It tests Urea cycle in Biochemistry. The correct option holds because: Correct. Urea-cycle defect 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 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.