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BIOS 2011 Lab 2 Photosynthesis

In the case of ps ii the primary electron acceptor

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Unformatted text preview: lant cell. Let us follow the path of the electron starting at Photosystem II. The reaction center of Photosystem II (PS II) is referred to as P ­680 because of its absorption peak. Collected energy from its antenna system allows it to reach a highly excited state. In an excited state, the electron is further away from the nucleus of the excited molecule, and is therefore more available to be "stolen" by an electron acceptor. In the case of PS II, the primary electron acceptor immediately passes the electron to another electron acceptor, and thus on through the electron transport chain, a series of high ­affinity acceptor molecules that transfer excited electrons through a specific sequence of exergonic reactions. This mechanism prevents P ­ 680 from regaining the electron. Deprived of its electron, P ­680 now has a very strong affinity for any available e...
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