photosynthesis notes

these chemicals provide photoprotection which may

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Unformatted text preview: ve to OBTAIN THEM FROM OUT DIET! We can't make them! Must eat carrots, etc…anything w/ antioxidants ** Key(Point:((Vegetable*and*fruit*have*unique*brilliant*colors*due*to* specific*carotenoids.*** ** These chemicals provide photoprotection which may decrease the risk of some diseases, particularly certain cancers and eye disease (prevent free radicals!) ExcitaBon(of(isolated(chlorophyll(molecule:((closed(system( Orbital'with'more' poten0al'energy' Energy' Difference' Fluorescence' A*par4cular*chlorophyll*pigments*(molecules)*will*absorb*only*photons*whose*energy*is*exactly* equal*to*the*difference*between*the*ground*state*and*the*excited*state* * Different*pigments*of*chlorophyll*will*absorb*photons*corresponding*to*par4cular*wavelengths* * Example:((( Chlorophyll*a*pigment*in*Photosystem*II*–*absorbs*light*at*a*wavelength*of*680*nm*–*called*P680* Chlorophyll*a*pigment*in*Photosystem*I*–*absorbs*light*at*a*wavelength*of*700*nm*–*called*P700* * However:* A plant leave exists in an open system. The energy released with chlorophyll electrons are excited by photon absorption is used to power the reactions. ExcitaBon(of(chlorophyll(within(a(leaf:((open)system) Which is what we encounter in nature Chloroplast*of*a*leaf* Photosystem) Photon* Thylakoid* Stroma* LightZHarves4ng* Reac4on*Center* Complex* Primary*electron* acceptor*...
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This document was uploaded on 02/04/2014.

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