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BIBC 102 – METABOLIC BIOCHEMISTRY MOHAMMAD H. MAKTABI Email : mmaktabi@ucsd.edu SXN : Mondays 5-5:50PM 6-6:50PM Handout # 6 I. Photosynthesis- turning sunlight into reduced carbons. A) Chloroplast - where photosynthesis occurs. It behaves a lot like a bacteria and it is an autotroph. It is a lot like the mitochondria in cells. Things to know: 1. Grana- stacks of thylakoids 2. Stroma- cytoplasm of the chloroplast. Where the carbons are fixed ( Dark Reactions) 3. Outer membrane- very permeable 4. Inner membrane- impermeable to essentially all ions and polar molecules. 5. Thylakoids - like the ER. Where energy is created ( Light Reactions ). B) Plants use photon light to create energy. 1. Chlorophylls - pigments that harvest photons (photoreceptor). a. photoreceptors - Colored molecules that absorb some parts of the colored spectrum and not others. b. This occurs through electron flow. 2. The key to all this is their alternating pi bonds . C) Light Havesting Complex (LHC) — captures photons and brings them to the reaction centers . 1. When light enters the complex, it causes electrons to be in an excited state and able to transfer there electrons to an electron acceptor to reduce that molecule. 2. Light catalyzes the reaction. D) Photochemical Reaction Centers — a redox reaction that occurs when electrons are transferred their, causing excitation. a)
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This note was uploaded on 04/16/2008 for the course PSYC 108 taught by Professor Staff during the Spring '06 term at UC Irvine.

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