Chlorophyll - Chlorophyll, Light Reactions chlorophyll -...

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Chlorophyll, Light Reactions chlorophyll - absorbs photons in a way similar to photoelectric effect porphyrin ring - ring structure w/ alternating single/double bonds w/ Mg atom in middle o energy channeled through carbon-bond system o side groups on outside of ring change absorption characteristics action spectrum - relative effectiveness of different light wavelengths on photosynthesis o T. W. Englemann - found that chlorophyll work best under red/violet light photoefficiency - high absorption efficiency leads to ability to absorb only a narrow bands of light o retinal absorbs large range of wavelengths but at low efficiency carotenoids - made of carbon rings linked to chains w/ alternating single/double bonds responsible for change in leaf color in fall not very efficient in transferring energy, but absorbs a wide range of energies beta-carotene - typical carotenoid; 2 carbon ring connected by 18-carbon chain o halves same as vitamin A o oxidation of vitamin A >> creates retinal, pigment used for vertebrate vision light-reactions - 4 stages primary photoevent - light photon captured by pigment, exciting the electrons in the pigment
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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Chlorophyll - Chlorophyll, Light Reactions chlorophyll -...

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