BI 107 Dr. R. Potter PHOTOSYNTHESISI. Photosynthesis - Conversion of sun's electromagnetic energy to chemical energy in glucose (and other organic molecules) using CO2and H2O as raw materials. Also forms atmospheric O2. A. occurs in chloroplast - see text for structure B. uses visible light - primarily red and blue C. primary pigment - chlorophyll a - only one that initiates photosynthesis by releasing energized electrons to other electron acceptors (ex-cytochromes). D. Accessory pigments - absorb sunlight also, but only release energized electrons to chlorophyll a. Ex-chlorophyll b, carotenoids, xanthophylls. II. Photosystems - organization of chlorophyll a, accessory pigments, electron acceptors, enzymes, etc. A. Photosystem I - based on chlorophyll a P700 B. Photosystem II - based on chlorophyll a P680 III. Light dependent reactions - sun's energy incorporated into ATP, NADPH. Pigments absorb photons, release energized electrons. One electron per photon. Chemiosmotic phosphorylation occurs.
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