Vitamin metabolism: 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 · Vitamin metabolism

Sample item

Which action is promoted by active vitamin D in calcium homeostasis?

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

The answer and the reasoning

B. Increase intestinal calcium absorption

Active vitamin D increases intestinal absorption of calcium and phosphate and works with parathyroid hormone and bone remodeling to maintain appropriate extracellular calcium concentration.

Option by option

  • A. Block renal sodium reabsorption

    Sodium reabsorption is regulated primarily by renal and hormonal mechanisms other than vitamin D.

  • B. Increase intestinal calcium absorption (correct)

    Correct: vitamin D increases intestinal calcium uptake.

  • C. Inhibit all osteoclast activity permanently

    Vitamin D does not permanently inhibit all osteoclast function.

  • D. Convert glucose into glycogen directly

    Direct glycogen synthesis is an insulin-related metabolic process.

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, Increase intestinal calcium absorption. Active vitamin D increases intestinal absorption of calcium and phosphate and works with parathyroid hormone and bone remodeling to maintain appropriate extracellular calcium concentration.

Why is "Block renal sodium reabsorption" not the answer?

Sodium reabsorption is regulated primarily by renal and hormonal mechanisms other than vitamin D.

Why is "Inhibit all osteoclast activity permanently" not the answer?

Vitamin D does not permanently inhibit all osteoclast function.

Why is "Convert glucose into glycogen directly" not the answer?

Direct glycogen synthesis is an insulin-related metabolic process.

What concept does this question test?

It tests Vitamin metabolism in Biochemistry. The correct option holds because: Correct: vitamin D increases intestinal calcium uptake.

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 Vitamin metabolism?

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.