Lect10 - 0 Lecture 10 Chloroplast and Photosynthesis 1...

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Unformatted text preview: 0 Lecture 10 Chloroplast and Photosynthesis 1 Important concepts 1. Understand electron excitement by photon Structure of chlorophyll 2. Understand cyclic electron flow in photosynthetic bacteria 3. Understand non-cyclic electron flow (two photosystems) in plants Memorize how electron is transported Understand Q-cycle in cytochrome bf Memorize how NADPH is generated 2 Photosynthesis Overview • photosynthesis is the source of essentially all the carbon compounds (primarily sucrose and starch) and all the oxygen that makes aerobic metabolism possible • Like electron transport chain and oxidative phosphorylation • Except electrons come from light and generate NADPH and produce O 2 (by splitting H 2 O) LIGHT 2 2 2 2 CO +H O (CH O)+O 3 Light Reactions Light ( h n) Oxidize Generate & Reduce NADP pigments H + gradient to NADPH Synthesize ATP 4 Chloroplast: Where it all goes on Micrograph of a spinach leaf 5 Chloroplast: Where it all goes on • Like mitochondrion, two membranes (inner and outer) • Interior called stroma — contains soluble enzymes that utilize the NADPH and ATP to covert CO 2 into sugar • Thylakoid compartments (stacked disks surrounded by membranes, infoldings of inner membrane) — contain light reaction proteins, electron transporting proteins, ATP synthesizing proteins granum 6 Inner Membrane Outer Membrane Cytosol H + Cytosol Chloroplast Stroma Lumen Thylakoid Chloroplast Outer membrane: permeable to most small molecules and ions Inner and thylakoid membranes: impermeable to … 7 Photosynthesis: light absorption by chlorophyll Photon excites electron Electron transport chain to produce proton gradient Proton gradient to generate ATP 8...
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This note was uploaded on 03/04/2012 for the course CHEM 114B taught by Professor Wang during the Spring '09 term at UCSD.

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Lect10 - 0 Lecture 10 Chloroplast and Photosynthesis 1...

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