Amino acids: 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.

Try it

Biochemistry · Amino acids

Sample item

What amino acid is precursor of histamine?

ATryptophanBMethionineCTyrosineDHistidine

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

The answer and the reasoning

D. Histidine

This item reviews Amino acids; Histidine is the best answer because it directly matches the biochemical or pathological mechanism described.

Option by option

A. Tryptophan
Tryptophan does not fit the stated mechanism.
B. Methionine
Methionine is unsupported by the key finding.
C. Tyrosine
Tyrosine is plausible but not the best answer.
D. Histidine (correct)
Correct. Histidine fits the defining feature.

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.

Questions about this Biochemistry question

What is the answer to this Biochemistry question?

The best answer is D, Histidine. This item reviews Amino acids; Histidine is the best answer because it directly matches the biochemical or pathological mechanism described.

Why is "Tryptophan" not the answer?

Tryptophan does not fit the stated mechanism.

Why is "Methionine" not the answer?

Methionine is unsupported by the key finding.

Why is "Tyrosine" not the answer?

Tyrosine is plausible but not the best answer.

What concept does this question test?

It tests Amino acids in Biochemistry. The correct option holds because: Correct. Histidine 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 Amino acids?

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.