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The Cycles of Photophosphorylation
There are two different light reaction cycles that occur in the thylakoid membrane within the chloroplast. The first, and most complex cycle is the non-cyclic. It begins with an H20 molecule splitting into 2H+ and &frac12; O2 in the process of photolysis. (During photolysis oxygen is released as a byproduct.) The two electrons lost from H20 are transferred to chlorophyll 680. Different pigments in Photosystem II can absorb specific wavelengths of light. The energy from light causes the electrons to become charged and move from P680 to the Primary Acceptor.
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