Ch10Photosynthesispt2 - AP Biology Ch 10 PhotosynthesisPart...

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AP Biology Ch 10 PhotosynthesisPart 2 : Light dependent reactions Jason Shah 1. What is a photosystem? How does a reaction center work as part of a photosystem? What does P700 mean? A photosystem is a network of chlorophyll a molecules, accessory pigments, and associated proteins held within a protein matrix on the surface of the photosynthetic membrane. Trans-membrane protein-pigment complex. Passes an excited electron to an acceptor on its neighbor. Ccreates strong electron donor where none existed before. P700 is the absorption peak of photosystem I pigments in plants, which is 700 nanometers. Summarize the relationship among light, pigments, electrons, and chemiosmosis. When light energy is absorbed by a pigment molecule, an electron is raised to a higher energy level called the excited state. The electron will be lowered back to its original level known as ground state. As the electron is lowered back, energy is released as heat or light (phosphorescence or fluorescence). The electrons that are shuttled along electron-carrier molecules bring along protons with them. When these protons build up on one side of the membrane, they flow across the membrane through specific protein complexes where chemiosmotic
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This test prep was uploaded on 04/10/2008 for the course AP BIO taught by Professor Gordon during the Spring '06 term at Fairfield.

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Ch10Photosynthesispt2 - AP Biology Ch 10 PhotosynthesisPart...

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