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Lecture-10-Photosynt_38494

Lecture-10-Photosynt_38494 - Photosynthesis Energy LIGHT...

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Photosynthesis Converts Light Energy to Chemical Energy: 6 CO 6 H O LIGHT C H O 6 O CO 2 H O • Photosynthesis directly & indirectly supplies the 2 + 6 H 2 O C 6 H 12 6 + 6 O 2 H 2 O O 2 Earth’s organic compounds: Recall the roles of autotrophs & heterotrophs Chloroplasts are the sites of photosynthesis H 2 O taken up In plant leaves found in mesophyll tissue by root system Chlorophyll – green, light absorbing pigment G h (CO O ) Gas exchange (CO 2 , O 2 ) thru stomata Some bacteria, all algae, & certain other protists are photosynthetic
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Chloroplasts • Organelles enclosed by a double membrane Intermembrane space Stroma: fluid filled region enclosed by inner membrane Thylakoids: disc like sacs; b i membranes contain chlorophyll location of photo synthetic reactions grana : stacks of thylakoid sacs
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Reactions of Photosynthesis: Ph t th i i d Oxidation (loss of electrons ) • Photosynthesis is a redox process: 6 CO 2 + 6 H 2 O C 6 H 12 O 6 6 O 2 + Light energy chlorophyll Reduction (gain of electrons) • Electron flow is “uphill”; reversed compared to cell respiration: water oxidized Æ e ’s + H + ’s Æ reduce CO 2 to sugar [requires energy] h h i i • Photosynthesis occurs in two stages (1) Light reactions : light energy captured by chlorophyll drives electron flow from water to NADP + (electron acceptor) forming NADPH; also flow from water to NADP (electron acceptor) forming NADPH; also generate ATP’s (via photophosphorylation) in the process (2) Calvin Cycle: carbon fixation ; incorporate CO into organic mole ; incorporate CO 2 into organic mole cules & reduce (using NADPH’s) to sugars; also requires ATP’s (energy).
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