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

During prolonged fasting, which hepatic pathway produces glucose from lactate and amino-acid carbon skeletons?

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

The answer and the reasoning

A. Gluconeogenesis

Gluconeogenesis synthesizes new glucose from non-carbohydrate precursors such as lactate, glycerol, and glucogenic amino acids during prolonged fasting.

Option by option

  • A. Gluconeogenesis (correct)

    Correct: gluconeogenesis makes new glucose from non-carbohydrate precursors.

  • B. Pentose phosphate pathway

    The pentose phosphate pathway makes NADPH and ribose phosphates.

  • C. Glycogenesis

    Glycogenesis stores glucose as glycogen after feeding.

  • D. Glycogenolysis

    Glycogenolysis releases glucose from pre-existing glycogen stores.

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 A, Gluconeogenesis. Gluconeogenesis synthesizes new glucose from non-carbohydrate precursors such as lactate, glycerol, and glucogenic amino acids during prolonged fasting.

Why is "Pentose phosphate pathway" not the answer?

The pentose phosphate pathway makes NADPH and ribose phosphates.

Why is "Glycogenesis" not the answer?

Glycogenesis stores glucose as glycogen after feeding.

Why is "Glycogenolysis" not the answer?

Glycogenolysis releases glucose from pre-existing glycogen stores.

What concept does this question test?

It tests Carbohydrate metabolism in Biochemistry. The correct option holds because: Correct: gluconeogenesis makes new glucose from non-carbohydrate precursors.

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.