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6. Photosynthesis

6. Photosynthesis - Photosynthesis Photosynthesis In simple...

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Photosynthesis Photosynthesis - In simple terms: photosynthesis uses light energy (photons) to make organic compounds (sugars) - 6CO2 + 6H2O -> C6H12O6 + O2 - It is the most important set of chemical reactions in the biosphere - Revisit 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 so: thus called a redox reaction - The same molecule can be: o Oxidized by one molecule o Reduced reduced by a different molecule - Affinity for electrons controls direction of electron flow Electron carriers - Electron carriers: molecules that can be reversibly oxidized and reduced o Can accept and donate e - Wary in their affinity for electron o Arrange by increasing affinity for electrons: electron transport chain (series of oxidatinon/reduction) o 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 toOc, and HT^+ during part of phtosynteuos - We are going to reduce CO2 to glucose during part of photosynthesis (also endergonic) 6CO2+ 6H2-> 62H12O6 + 6O2
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- Endergonic energy input: the sun! Site of photosynthesis (figure 8.1) - Occurs within cells, usually in the leaf - Organelle involved is the chloroplast - Structure of choloroplast is important o Thylakoid membranes: Create enclosed compartment within disks o Must be intact for photosynthesis to occur Must maintain H+ concentration gradient Two parts to photosynthesis: light reactions - Light reactions (occur in thylakoid) o Requires light as energy as source o Oxidize H2Oproduce ATP & NADPH (reducing power)
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