Biology NEET Previous Year Question Paper NEET 2022 Previous Year Question Paper Single Correct MCQ
Published on: August 13, 2026

Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis? It involves:

A
Breakdown of proton gradient
B
Breakdown of electron gradient
C
Movement of protons across the membrane to the stroma
D
Reduction of NADP to NADPH 2

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The correct answer is:
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Chemiosmosis requires a membrane, a proton pump, a proton gradient and ATP synthase. Energy is used to pump protons across a membrane to create a gradient or a high concentration of protons within the thylakoid lumen.

The enzyme, NADP reductase is located on the stroma side of the membrane. Along with the electrons that come from the acceptor of electrons of PS I, protons are necessary for the reduction of NADP^ to NADPH and H + . The process does not involve breakdown of electron gradient.

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