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.

Try it

Biochemistry · Vitamins

Sample item

Which vitamin is required as a cofactor for gamma-carboxylation of clotting factors?

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

The answer and the reasoning

D. Vitamin K

Vitamin K is needed to gamma-carboxylate several clotting factors, enabling their calcium-dependent function in normal coagulation.

Option by option

  • A. Vitamin E

    Vitamin E is an antioxidant vitamin.

  • B. Folate

    Folate supports one-carbon transfer reactions.

  • C. Vitamin B1

    Thiamine functions in carbohydrate metabolism.

  • D. Vitamin K (correct)

    Correct: vitamin K activates key clotting proteins.

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 D, Vitamin K. Vitamin K is needed to gamma-carboxylate several clotting factors, enabling their calcium-dependent function in normal coagulation.

Why is "Vitamin E" not the answer?

Vitamin E is an antioxidant vitamin.

Why is "Folate" not the answer?

Folate supports one-carbon transfer reactions.

Why is "Vitamin B1" not the answer?

Thiamine functions in carbohydrate metabolism.

What concept does this question test?

It tests Vitamins in Biochemistry. The correct option holds because: Correct: vitamin K activates key clotting proteins.

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.