What is the difference between photosynthesis I and photosynthesis II?
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Answer:
Photosynthesis I and II are named after photosystems I and II, respectively. Counterintuitively, photosystem II comes before photosystem I in the light-dependent reactions of photosynthesis. There are other differences: PSII uses a pair of P680 chlorophyll a, while PSI uses a pair of P700 chlorophyll a. PS II utilizes plastoquinone, which then passes the high-energy electron to cytochromes b6 and f. Photosystem I, on the other hand, passes the electron to ferredoxin. In the non-cyclic version of photophosphorylation, PS II is responsible for the photolysis of water and subsequent synthesis of ATP. PS I, in this process, converts NADP+ to NADPH.
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