Which of the following statements about the mechanism of the light-dependent reactions of photosynthesis is correct?a) Electrons from photosystem I reduce NADPH.b) Electrons from photosystem I reduce pheophytin.c) Electrons from NADPH revert photosystem II back to the ground state.d) Ferredoxin-NADP reductase reduces NADP+ to NADPH.
Question
Which of the following statements about the mechanism of the light-dependent reactions of photosynthesis is correct?a) Electrons from photosystem I reduce NADPH.b) Electrons from photosystem I reduce pheophytin.c) Electrons from NADPH revert photosystem II back to the ground state.d) Ferredoxin-NADP reductase reduces NADP+ to NADPH.
Solution
The correct statement about the mechanism of the light-dependent reactions of photosynthesis is:
d) Ferredoxin-NADP reductase reduces NADP+ to NADPH.
Here's why:
a) Electrons from photosystem I do not reduce NADPH. Instead, they are transferred to a series of proteins in the thylakoid membrane, eventually leading to the reduction of NADP+ to NADPH.
b) Electrons from photosystem I do not reduce pheophytin. Pheophytin is a molecule involved in photosystem II, not photosystem I.
c) Electrons from NADPH do not revert photosystem II back to the ground state. The energy to revert photosystem II back to its ground state comes from the absorption of light, not from electrons.
d) Ferredoxin-NADP reductase is an enzyme that catalyzes the final step in the light reactions of photosynthesis, the reduction of NADP+ to NADPH. This is a correct statement.
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