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Compare and contrast cyclic and noncyclic photophosphorylatio n.
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Both cyclic photophosphorylatio n and noncyclic photophosphorylatio n are aspects of the light-dependent reactions of photosynthesis. They both involve the excitation of electrons by solar energy; these excited electrons then participate in an electron transport pathway to create a proton gradient that can be used to produce ATP through chemiosmosis. However, as its name implies, cyclic photophosphorylatio n occurs when electrons return to the chlorophyll molecules whence they came. Excited electrons in noncyclic photophosphorylatio n are also used in the same way to produce ATP; however, these electrons are donated to an NADP+ molecule at the end of their transport chain, producing NADPH as a product of the system. Because electrons are constantly leaving the chlorophyll molecules where they are being excited, and not returning, there must also be a steady source of electrons for the photosystem. These electrons can come from molecules such as water or hydrogen sulfide.
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