Photosynthesis160-page6 - There are two such...

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Photosynthesis - 6 Excitation of Isolated Chlorophyll Molecules Excitation of Chlorophyll in Chloroplasts The Photosystems The photosynthetic pigment molecules do not work alone. They are arranged on the thylakoids of the chloroplast in clusters of about 200 - 300 pigment molecules (plus some protein molecules) in a light-harvesting complex (sometimes called the antenna complex) that gathers and transfers energy to a reaction center that has a special chlorophyll a molecule.
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Unformatted text preview: There are two such light-harvesting complexes found in the chloroplasts, called Photosystem I and Photosystem II. The reaction centers of Photosystems I and II are activated by slightly different wavelengths of light. In addition to the light-harvesting complexes, each photosystem has a primary electron acceptor, which accepts the electrons released from chlorophyll a, and an associated electron transfer system....
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