Which of these statements is incorrect ?

1. Enzymes of TCA cycle are present in mitochondrial matrix.

2. Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.

3. Glycolysis occurs in cytosol.

4. Oxidative phosphorylation takes place in outer mitochondrial membrane.

Doubtly Asked 30 Oct 2026 NEET UG 2018 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 4. Oxidative phosphorylation takes place in outer mitochondrial membrane.

Key idea: Check where each respiratory step occurs.

TCA cycle enzymes are in the mitochondrial matrix. Glycolysis is in the cytosol. Both correct.
Glycolysis needs NAD⁺ to accept hydrogen, so statement 2 is correct.
Oxidative phosphorylation happens on the inner mitochondrial membrane (ETC and ATP synthase), not the outer membrane.

Answer: option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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