BIOS 2011 Lab 2 Photosynthesis

The electron hole created in p700 drives the electron

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Unformatted text preview: lectrons. Water serves as the electron donor to P ­680, and is thereby split into 2 protons (H+) and 1/2 O2 . This splitting of water is known as Hill's reaction, or photolysis; water serves as the source for the liberation of oxygen. The electron in the electron transport chain is eventually accepted by P ­700, the reaction center of Photosystem I (PS I). Light causes a second excitation event whereby the electron from the PS I reaction center is boosted to a yet higher energy level and is accepted by a different primary electron acceptor. The electron "hole" created in P ­700 drives the electron transport chain, since it is filled by the electron transported down the electron chain from PS II. It may help to think of PS I as a "vacuum sucking the electrons down the electron transport chain." The high energy electron boosted from P ­700 is transported through another series of oxidation...
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