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

What coenzyme form of vitamin B6 is important in amino acid metabolism?

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

The answer and the reasoning

B. Pyridoxal phosphate

Pyridoxal phosphate is the active vitamin B6 coenzyme used in transamination, decarboxylation, and other amino acid metabolic reactions.

Option by option

  • A. Cobalamin

    Cobalamin is vitamin B12, not B6.

  • B. Pyridoxal phosphate (correct)

    Correct: pyridoxal phosphate is the active B6 coenzyme.

  • C. Biotin

    Biotin supports carboxylase reactions.

  • D. Tetrahydrofolate

    Tetrahydrofolate is derived from folate and transfers one-carbon units.

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, Pyridoxal phosphate. Pyridoxal phosphate is the active vitamin B6 coenzyme used in transamination, decarboxylation, and other amino acid metabolic reactions.

Why is "Cobalamin" not the answer?

Cobalamin is vitamin B12, not B6.

Why is "Biotin" not the answer?

Biotin supports carboxylase reactions.

Why is "Tetrahydrofolate" not the answer?

Tetrahydrofolate is derived from folate and transfers one-carbon units.

What concept does this question test?

It tests Vitamins in Biochemistry. The correct option holds because: Correct: pyridoxal phosphate is the active B6 coenzyme.

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.