Vitamins: 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 · Vitamins

Sample item

Which vitamin acts as a coenzyme in carboxylation reactions?

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

The answer and the reasoning

C. Biotin

Biotin is a cofactor for carboxylase enzymes involved in gluconeogenesis, fatty-acid synthesis, and amino-acid metabolism.

Option by option

  • A. Pyridoxine

    Pyridoxine supports transamination.

  • B. Niacin

    Niacin forms NAD and NADP.

  • C. Biotin (correct)

    Correct: biotin carries activated carbon dioxide.

  • D. Riboflavin

    Riboflavin forms FAD and FMN.

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, Biotin. Biotin is a cofactor for carboxylase enzymes involved in gluconeogenesis, fatty-acid synthesis, and amino-acid metabolism.

Why is "Pyridoxine" not the answer?

Pyridoxine supports transamination.

Why is "Niacin" not the answer?

Niacin forms NAD and NADP.

Why is "Riboflavin" not the answer?

Riboflavin forms FAD and FMN.

What concept does this question test?

It tests Vitamins in Biochemistry. The correct option holds because: Correct: biotin carries activated carbon dioxide.

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 Vitamins?

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.