Carbohydrate 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 · Carbohydrate metabolism

Sample item

Which pathway supplies NADPH for reductive biosynthesis?

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

The answer and the reasoning

A. Pentose phosphate pathway

The oxidative pentose phosphate pathway produces NADPH, which supports fatty-acid synthesis, antioxidant defence, and reductive reactions.

Option by option

  • A. Pentose phosphate pathway (correct)

    Correct: PPP is a major NADPH source.

  • B. Citric acid cycle only

    TCA cycle produces reducing equivalents mainly as NADH.

  • C. Glycolysis

    Glycolysis mainly produces ATP and NADH.

  • D. Urea cycle

    Urea cycle disposes of ammonia.

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.

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Questions about this Biochemistry question

What is the answer to this Biochemistry question?

The best answer is A, Pentose phosphate pathway. The oxidative pentose phosphate pathway produces NADPH, which supports fatty-acid synthesis, antioxidant defence, and reductive reactions.

Why is "Citric acid cycle only" not the answer?

TCA cycle produces reducing equivalents mainly as NADH.

Why is "Glycolysis" not the answer?

Glycolysis mainly produces ATP and NADH.

Why is "Urea cycle" not the answer?

Urea cycle disposes of ammonia.

What concept does this question test?

It tests Carbohydrate metabolism in Biochemistry. The correct option holds because: Correct: PPP is a major NADPH source.

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 Carbohydrate 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.