Pyrimidines: 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 · Pyrimidines

Sample item

Which base is unique to RNA?

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

The answer and the reasoning

A. Uracil

This item reviews Pyrimidines; Uracil is the best answer because it directly matches the biochemical or pathological mechanism described.

Option by option

  • A. Uracil (correct)

    Correct. Uracil fits the defining mechanism.

  • B. Thymine

    Thymine does not fit the stated pattern.

  • C. Adenine

    Adenine is unsupported by the key feature.

  • D. Guanine

    Guanine is plausible but not the best answer.

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 A, Uracil. This item reviews Pyrimidines; Uracil is the best answer because it directly matches the biochemical or pathological mechanism described.

Why is "Thymine" not the answer?

Thymine does not fit the stated pattern.

Why is "Adenine" not the answer?

Adenine is unsupported by the key feature.

Why is "Guanine" not the answer?

Guanine is plausible but not the best answer.

What concept does this question test?

It tests Pyrimidines in Biochemistry. The correct option holds because: Correct. Uracil fits the defining mechanism.

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 Pyrimidines?

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.