Lecture 10 - 012611

Lecture 10 - 012611 - Lecture 10 Chloroplast and...

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Unformatted text preview: Lecture 10 Chloroplast and Photosynthesis 1 Photosynthesis photosynthesis is the source of essentially all the carbon compounds and all the oxygen that makes aerobic metabolism possible 4.2x10 17 kJ of free energy stored annually by photosynthesis on Earth Like electron transport chain and oxidative phosphorylation Except electrons come from light (not from food) and generate NADPH and produce O 2 (by splitting H 2 O) 2 Light Reactions Light ( h ) Oxidize Generate & Reduce NADP pigments H + gradient to NADPH Synthesize ATP 3 Chloroplast: Where it all goes on Micrograph of a spinach leaf 4 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 5 Inner Membrane Outer Membrane H + Cytosol Chloroplast Stroma Cytosol Lumen Thylakoid Chloroplast Outer membrane: permeable to most small molecules and ions Inner and thylakoid membranes: impermeable to 6 Inner Membrane Outer Membrane H + Cytosol Cytosol Mitochondrion Cristae Matrix Intermembrane space Outer membrane: permeable to most small molecules and ions Inner membrane: impermeable to 7 Photosynthesis: light absorption by chlorophyll 8...
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This note was uploaded on 08/15/2011 for the course CHEM 114B taught by Professor Wang during the Spring '09 term at UCSD.

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Lecture 10 - 012611 - Lecture 10 Chloroplast and...

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