Question

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 NADPH2 on the stroma side of the membrane

Answer 1

Answer: (B)

Breakdown of electron gradient

Answer 2

Chemiosmotic hypothesis explains the mechanism of ATP synthesis in the thylakoids of chloroplast. In photosynthesis, the synthesis of ATP is linked to the development of a proton gradient across the cell membrane. No electron gradient is formed during generation of ATP.