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

What is the rate-limiting enzyme of glycolysis?

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

The answer and the reasoning

C. Phosphofructokinase-1

The core Carbohydrate metabolism principle identifies Phosphofructokinase-1 as the best answer because it most directly explains the biochemical pathway or tissue response described in the stem.

Option by option

  • A. Pyruvate carboxylase

    Pyruvate carboxylase is relevant in another context but is not the best answer here.

  • B. Hexokinase

    Hexokinase does not match the stated carbohydrate metabolism mechanism.

  • C. Phosphofructokinase-1 (correct)

    Correct. Phosphofructokinase-1 is supported by the key clue given.

  • D. Glucose-6-phosphatase

    Glucose-6-phosphatase does not account for the central finding in this sample.

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, Phosphofructokinase-1. The core Carbohydrate metabolism principle identifies Phosphofructokinase-1 as the best answer because it most directly explains the biochemical pathway or tissue response described in the stem.

Why is "Pyruvate carboxylase" not the answer?

Pyruvate carboxylase is relevant in another context but is not the best answer here.

Why is "Hexokinase" not the answer?

Hexokinase does not match the stated carbohydrate metabolism mechanism.

Why is "Glucose-6-phosphatase" not the answer?

Glucose-6-phosphatase does not account for the central finding in this sample.

What concept does this question test?

It tests Carbohydrate metabolism in Biochemistry. The correct option holds because: Correct. Phosphofructokinase-1 is supported by the key clue given.

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.