Fundamentholfundamenthol
NEET2022Biology
Q.

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

  1. A

    Breakdown of proton gradient

  2. B

    Breakdown of electron gradient

  3. C

    Movement of protons across the membrane to the stroma

  4. D

    Reduction of NADP to NADPH on the stroma side of the membrane

Solution

Chemiosmosis is the mechanism that couples electron transport with ATP synthesis. The light reactions of photosynthesis pump protons into the thylakoid lumen, building a proton (H) gradient.

ATP is then produced as protons flow back to the stroma through ATP synthase. The driving force is the proton gradient, not an 'electron gradient'.

Statement (2) is therefore incorrect; the other three statements describe legitimate aspects of photophosphorylation by chemiosmosis.

← Back to full paper

Practice more Biology

Concept-wise practice with instant solutions on Fundamenthol.

Start practicing →