Oxidative stress: 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 · Oxidative stress

Sample item

Which enzyme converts superoxide radical to hydrogen peroxide?

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

The answer and the reasoning

C. Superoxide dismutase

Superoxide dismutase converts superoxide to hydrogen peroxide, which is then detoxified by catalase or glutathione peroxidase.

Option by option

  • A. Lactate dehydrogenase

    LDH interconverts lactate and pyruvate.

  • B. Glutathione peroxidase

    Glutathione peroxidase reduces peroxides.

  • C. Superoxide dismutase (correct)

    Correct: SOD is the first superoxide-detoxifying enzyme.

  • D. Catalase

    Catalase breaks down hydrogen peroxide.

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, Superoxide dismutase. Superoxide dismutase converts superoxide to hydrogen peroxide, which is then detoxified by catalase or glutathione peroxidase.

Why is "Lactate dehydrogenase" not the answer?

LDH interconverts lactate and pyruvate.

Why is "Glutathione peroxidase" not the answer?

Glutathione peroxidase reduces peroxides.

Why is "Catalase" not the answer?

Catalase breaks down hydrogen peroxide.

What concept does this question test?

It tests Oxidative stress in Biochemistry. The correct option holds because: Correct: SOD is the first superoxide-detoxifying enzyme.

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 Oxidative stress?

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.