06-Photosynthesisnotes_(MS_Word_compatible)

06-Photosynthesisnotes_(MS_Word_compatible) -...

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Photosynthesis Photosynthesis In simple terms, photosynthesis uses light energy (photons), to make organic compounds (sugars) 6CO2+6H2O→C6H12O6+6O2 It is the most important set of chemical reactions in the biosphere Revisit some basic chemistry Loss and gain of electrons Redox reactions (revisited) Oxidation-the loss of electrons (In biological systems: often dehydrogenation) Reduction- the gain of electrons Usually coupled- thus called a redox reaction The same molecule can be oxidized by one molecule reduced by different molecule Affinity for electrons controls the electron flow Electron carriers Electron carriers-molecules that can be reversibly oxidized and re- duced can accept and donate electrons vary in their affinity for electrons arrange by increasing affinity for electrons: electron transport chain gradual release of energy that can be captured Allows maximal synthesis of ATP What does this have to do with photosynthesis? We are going to oxidize H2O to O2 and H+ during part of photosyn- thesis (Endergonic- energy input required) We are going to reduce CO2 to glucose during part of photosyn- thesis (also endergonic) 6CO2 + 6H2O → C6H12O6 + 6O2 Endergonic energy input! The SUN!
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Site of photosynthesis Occurs within cells, usually in the leaf Organelle involved is the chloroplast Structure of chloroplast is important Thylakoid membranes create enclosedd compartment within disks must be intact for photosynthesis to occur must maintain H+ concentration gradient Stroma- compartment where soluble reactions occur
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