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Department
Molecular Genetics and Microbiology
Course
MGY377H1
Professor
William Navarre
Semester
Fall

Description
09Metabolism IIPhototrophy Use of light as energy sourceWidespread in prokaryotesPhotosynthesisconversion of light energy to chemical energy Two classes o Photoautotrophscarbon dioxide used for carbono Photoheterotrophsorganic carbon sourcesPhotosystems derive energy from sunlight Act like electron transport chain Generate proton gradient across photosynthetic membrane Proton motive force drives ATP synthesis Found in photosynthetic membraneso Plantschloroplasts intracellular organelleo Bacteriacytoplasmic membrane internal membrane derived from cytoplasmic membrane that can become vesicles cytoplasmic membrane but associated with specialized membraneenclosed structures called chlorosomes thylakoid membranes in cyanobacteria Components of photosystemsLight harvesting pigmentso Ex Chlorophyll a plants algae cyanobacteria o Bacteriochlorphyll a purple and green bacteria o Chlorophyll a Hydrophobic segments attached to ring structure allow for pigment to associate with membrane as fatty acid chain to be inserted in
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