Photosynthesis

Photosynthesis - Photosynthesis Photosynthesis...

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Photosynthesis Photosynthesis In simple terms: photosynthesis uses light energy (photons) to make  organic compounds (sugars) 6CO2 + 6H2O C6H12O6 + 6O2 Most important set of chemical reactions in the biosphere Loss and gain of electrons Redox reactions (revisited) Oxidation-loss of electrons In biological systems: often dehydrogenation Reduction-gain of electrons Usually coupled so-redox The same molecule can be oxidized and reduced Affinity for electrons controls direction of electron flow Electron carriers Electron carriers-molecules that can be reversibly oxidized and reduced Can accept and donate electrons Vary in their affinity for electrons
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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 photosynthesis Endergonic-energy input required We are going to reduce CO2 to glucose during part of photosynthesis Also endergonic Energy input comes from the sun!!!!!! Site of photosynthesis(fig 8.1) Occurs with in cells, usually in the leaf Organelle involved is the chloroplast Structure of chloroplast is important Thylakoid membranes o Create enclosed compartment with in disks Must be intact for photosynthesis to occur o Must maintain H+ concentration gradient
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Stroma: compartment where soluble reactions occur Two parts to photosynthesis: light reactions Occur in thylakoid Requires light as energy source Oxidize H2O Produce ATP and NADPH (reducing power)
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Photosynthesis - Photosynthesis Photosynthesis...

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