Photophosphorylation requires A) ATP synthase. B) the production of NADP⁺. C) a low concentration of protons in the thylakoid lumen. D) a flow of electrons from photosystem I to photosystem II. E) darkness.

Question

Quizplus · Accepted Answer

Photophosphorylation is the process of generating ATP using the energy of sunlight. This process involves chemiosmosis, a process that requires ATP synthase to produce ATP. The enzyme uses the energy from the proton gradient established in the thylakoid lumen to phosphorylate ADP to ATP.

Answer: C
 Photophosphorylation involves the establishment of a proton gradient across the thylakoid membrane, where protons are pumped from the stroma to the thylakoid lumen. A low concentration of protons in the thylakoid lumen is required for chemiosmosis, the process that drives ATP synthesis by ATP synthase.

Photophosphorylation Requires