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Unformatted text preview: 19-1PhotosynthesisPhotosynthesis•Photosynthesis represents two processes•light reactions: NADPHand ATPare produced•dark reactions: ATPand NADPHprovide the energy and reducing power for the fixation of CO26 CO2+ 6 H2OC6H1 2O6+ 6 O2GlucoseH2O + NADP+NADPH+H++1 / 2 O2ADP+PiATP+H2O19-2PhotosynthesisPhotosynthesis•Site of photosynthesis•Prokaryotes: in granulesbonded to the plasma membrane•Eukaryotes: in chloroplasts•Chloroplasts have:•inner, outer, and thylakoidmembranes•thylakoiddisks are stacked into granatrapping of lightand production of Otake place in 19-3PhotosynthesisPhotosynthesisMembrane structures in chloroplasts19-4PhotosynthesisPhotosynthesisChlorophylls a and b, and bacteriochlorophyll aSimilar to heme groupof hemoglobin,except has Mgat centerSource of electrons for PSII19-5Chlorophylls (Chl) a & bChlorophylls (Chl) a & b•Absorb red(600 - 700 nm) and blue(400 - 500 nm) light•accessory pigmentsabsorb in other portions of the visible spectrum and transfer energy to chlorophylls •Chlorophylls arranged in photosynthetic units•antennae chlorophylls gather light•harvested light energy passed to specialized Chl molecules at areaction center•generally several hundred light-harvesting antennae Chl for each Chl at a reaction center•chemical reactions of photosynthesis begin at reaction centers19-6...
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lecture15 -...

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