Question

Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on

• A. Proton gradient.
• B. Accumulation of K${}^{-}$ ions.
• C. Accumulation of Na${}^{+}$ ions.
• D. Membrane potential.

Answer 1

The correct option is A Proton gradient.

According to the chemiosmotic mechanism of ATP synthesis, the process of phosphorylation whether in photophosphorylation or oxidative phosphorylation depends on electrochemical gradient of hydrogen ions across the thylakoid and or inner mitochondrial membrane, which is coupled to electron transport in these membranes.