Lecture-10-Photosynt_38494

Lecture-10-Photosynt_38494 - Photosynthesis...

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Photosynthesis Converts Light Energy to Chemical Energy: GHT CO • Photosynthesis directly & directly supplies the 6 CO 2 + 6 H 2 O LIGHT C 6 H 12 O 6 + 6 O 2 2 H 2 O O 2 indirectly supplies the Earth’s organic compounds: Recall the roles of autotrophs & heterotrophs Chloroplasts are the sites f photosynthesis H O taken up of photosynthesis In plant leaves found in mesophyll tissue 2 by root system Chlorophyll – green, light absorbing pigment Gas exchange (CO 2 , O 2 ) thru stomata me bacteria, all algae, Some bacteria, all algae, & certain other protists are photosynthetic
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Chloroplasts •O r ganelles enclosed by a double membrane termembrane Intermembrane space Stroma: fluid filled region enclosed by inner membrane Thylakoids: disc like sacs; membranes contain chlorophyll cation f hoto location of photo synthetic reactions rana tacks of grana : stacks of thylakoid sacs
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Reactions of Photosynthesis: 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) •E l e c t r o n flow is “uphill”; reversed compared to cell respiration: water oxidized Æ e ’s + H + ’s Æ reduce CO 2 to sugar [requires energy] •P hotosynthesis occurs in two stages (1) Light reactions : light energy captured by chlorophyll drives electron ow from water to NADP + lectron acceptor) forming NADPH; also flow from water to NADP (electron acceptor) forming NADPH; also generate ATP’s (via photophosphorylation) in the process ) Calvin Cycle: rbon fixation
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This note was uploaded on 04/23/2010 for the course BIOL 1361 taught by Professor Knapp during the Spring '05 term at University of Houston.

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Lecture-10-Photosynt_38494 - Photosynthesis...

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