Question

Which of the following is a part of photophosphorylation?

• A. Production of ATP from ADP
• B. Production of NADPH${}_2$
• C. Synthesis of ADP from ATP
• D. Both A and B

Answer 1

Answer: (D)

Both A and B

During photophosphorylation, electrons move from water through PSII, intermediate chain of carriers, through PSI, and finally to NADP+ causing its reduction into $NADP{H}_2$. Flow of electrons through the carriers linking PSII and PSI pump protons into the thylakoid lumen. These protons reenter the stroma through F${}_o$ proton channels of ATP synthase while F${}_1$ subunit (CF${}_1$) catalyzes synthesis of ATP. Correct answer is D.