Which of the following describes when does cyclic photophosphorylation take place?
A)when the NADPH/ NADP+ ratio is high and energy is used in generating ATP
B)when NADPH is high and therefore energy is used to drive the citrate cycle
C)when ferredoxin is used to reduce the Mn cluster
D)when the proton gradient is not high enough to go all the way through the system

Question

Quizplus · Accepted Answer

Cyclic photophosphorylation occurs when the NADPH/NADP+ ratio is high, indicating that the cell has sufficient NADPH. Under these conditions, the cell focuses on generating ATP without producing more NADPH, as ATP is still required for various cellular processes.

Which of the Following Describes When Does Cyclic Photophosphorylation Take