Question

Within the light-dependent reactions of photosynthesis, NADPH is?

a. produced after the electron transport chain results from the reenergized electrons in photosystem l.
b. used to replenish electrons found in photosystem ll.
c. made into NADP+ molecules.
d. produced through an electron transport chain resulting from engerized electrons in photosystem ll.

Answer 1

In photosynthetic organisms, NADPH is produced by ferredoxin-NADP+ reductase in the last step of the electron chain of the light reactions of photosynthesis. It is used as reducing power for the biosynthetic reactions in the Calvin cycle to assimilate carbon dioxide. It is used to help turn the carbon dioxide into glucose. It is also needed in the reduction of nitrate into ammonia for plant assimilation in nitrogen cycle.