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Lecture 5- photosynthesis

Aphotonoflightcanonlyexciteanelectronwhenthe

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Unformatted text preview: 0 !major"photosynthetic"pigments"in"plants,"green"algae," Chlorophyll 1202B Gardiner BIOLOGY • a – all photosynthetic organisms except bacteria • b – all higher plants (few exceptions), green algae • c – brown algae • d – red algae 20-Jan-13 yellow!orange"pigments"(cartonoids) and"cyanobacteria !"it"is"green"because"a"molecule"of"chlorophyll"does"not" have"an"excite"state"that"matches"the"energy"of"a"green" photon !"instead,"green"photon"is"either"re<lected"or"transmitted" by"the"pigment" 11 !"chlorophyll"structure" !"hydrophobic"side"chain!"can"be"held"in"place"in"a" membrane !"chlorophylls"a"and"b"only"differ"in"the"side"group" attached"to"the"X Fig. 7.6a 4 !"a"single"photon"of"light"excited"only"a"single"electron" within"a"pigment"molecule,"raising"it"from"the"ground"state" to"an"excited"state" !"a"photon"of"light"can"only"excite"an"electron"when"the" energy"of"the"photon"matches"the"amount"of"energy" required"to"raise"the"electron"from"ground"to"excited"state !"after"pigment"molecule"absorbs"light,"1"of"3"possible" events"...
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