Question

Chemiosmosis hypothesis given by Peter Mitchell proposes the mechanism of

• A. Synthesis of NADH.
• B. Synthesis of ATP.
• C. Synthesis of FADH${}_2$.
• D. Synthesis of NADPH.

Answer 1

The correct option is B Synthesis of ATP.

Chemiosmosis or chemiosmotic theory is given by Peter Mitchell explains the synthesis of ATP in the chloroplast. During the process of photosynthesis, the synthesis of ATP causes proton gradient to develop due to the accumulation of protons in thylakoid lumen that are formed by splitting of water. As the electron moves through the photosystem, protons are transported across the membrane. Now NADP reductase (enzyme) in stroma along with the electron acceptor removes protons along with the reduction of NADPH + H+. This causes proton gradient across the thylakoid membrane. The ATPase enzyme has a channel which allows the flow of proton through it and during this process the ATP is synthesised. Thus the correct answer is option B.