lec12 - Lecture 12 Chloroplast and Photosynthesis 0...

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0 Lecture 12 Chloroplast and Photosynthesis
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1 Photosynthesis 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) Light Reactions Light ( h n) Oxidize Generate & Reduce NADP pigments H + gradient to NADPH Synthesize ATP
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2 Chloroplast: Where it all goes on Like mitochondrion, two membranes (inner and outer) Interior called stroma — also like mitochondrion, contains DNA, RNA, ribosomes Stroma contains thylakoid compartments (stacked disks surrounded by membranes) — contain light reaction proteins, electron transporting proteins, ATP synthesizing proteins
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3 Inner Membrane Outer Membrane Cytosol H + Cytosol Cytosol Cytosol Chloroplast Stroma Lumen Thylakoid Chloroplast
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4 Inner Membrane Outer Membrane Cytosol H + Cytosol Cytosol Cytosol Mitochondrion Cristae Matrix Contrast with mitochondrion Intermembrane space
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5 Chlorophyll — Why plants are green Major light-absorbing pigment Much like heme , except among other things, Mg at center Pheophytin is chlorophyll a with 2 H + replacing Mg 2+ (e.g., in purple bacteria)
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6 Pigments absorb across the whole visible spectrum Blue Red Green
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This note was uploaded on 10/30/2010 for the course CHEM 114B taught by Professor Wang during the Winter '09 term at UCSD.

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lec12 - Lecture 12 Chloroplast and Photosynthesis 0...

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