Question

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

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

Answer 1

Answer: (D)

Proton gradient

Answer is "Proton gradient" option D

Chemiosmosis occurs in mitochondria and chlorplast. The electron transport chain forms a proton gradient across the inner mitochondrial membrane, which is major force needed for the synthesis of ATP.

While, accumulation of sodium ions, potassium ions and membrane potential are needed for transport of nutrients or impulses across membrane and not for ATP synthesis.