Lecture 5- photosynthesis

Thisistheabsorptionspectraof3photosynthetic

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Unformatted text preview: can"occur: 1."excited"electron"returns"to"ground"state,"releasing"energy" as"heat"or"light"of"longer"wavelength"(called"<luorescence)" Like Fig. 7.5 2."energy"of"excited"electron"is"transferred"to"neighbouring" pigment"molecule"in""a"process"called"inductive"resonance 3."excited"electron"is"transferred"from"pigment"molecule"to" a"nearby"electron!accepting"molecule"called"a"primary" acceptor" !"carotenoid"structure" !"help"increase"spectrum"of"useable"light" beta-carotene Carotenoids are often the major pigments in flowers and fruits. The red of a ripe tomato and the orange of a carrot are produced by their carotenoids. Fig. 7.6b !"absorption"spectrum:"plot"of"the"absorption"of"light"as"a" Absorption Spectrum function"of"wavelength" 20-Jan-13 Gardiner !"spectrophotometer:"allows"you"to"determine"the" wavelengths"of"light"absorbed"by"a"pigment"such"as" chlorophyll"by"producing"an"absorption"spectrum"for"that" pigment" 1202B – i.e. proteins absorb at 280 – nucleic acids at 260 BIOLOGY • Measures the % absorption of a particular pigment (or compound) vs a particular wavelength of light • Spectrophotometer can be used in the lab 15 5 !"light"source,"sent"through"set"of"specialized"mirrors," can"adust"one"wavelength"at"atime,"can"detect"if"is" absorbed"or"not" !"absorption"spectra"of"the"accessory"pigments" Absorption Spectrum (chlorophyll"b"and"carotenoids)"illustrates"that"these" pigments"expand"the"wavelengths"...
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