Energy 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 · Energy metabolism

Sample item

Where does the citric acid cycle occur in eukaryotic cells?

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

The answer and the reasoning

C. Mitochondrial matrix

The citric acid cycle occurs in the mitochondrial matrix, oxidizing acetyl-CoA and generating NADH and FADH2 for oxidative phosphorylation.

Option by option

  • A. Golgi apparatus

    Golgi modifies and sorts proteins.

  • B. Cytosol

    Cytosol contains glycolysis.

  • C. Mitochondrial matrix (correct)

    Correct: matrix enzymes run the TCA cycle.

  • D. Nucleus

    Nucleus stores genetic material.

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, Mitochondrial matrix. The citric acid cycle occurs in the mitochondrial matrix, oxidizing acetyl-CoA and generating NADH and FADH2 for oxidative phosphorylation.

Why is "Golgi apparatus" not the answer?

Golgi modifies and sorts proteins.

Why is "Cytosol" not the answer?

Cytosol contains glycolysis.

Why is "Nucleus" not the answer?

Nucleus stores genetic material.

What concept does this question test?

It tests Energy metabolism in Biochemistry. The correct option holds because: Correct: matrix enzymes run the TCA cycle.

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 Energy 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.