BIOL 2004 Lecture Notes - Lecture 17: Thylakoid, Anoxygenic Photosynthesis, Sulfur
Document Summary
Can prokaryotes be predators: strategies in 2 different groups of deltaproteobacteria. Phototrophy: conversion of light energy into chemical energy. (+ storage as organic molecules = photosynthesis, microorganisms are globally important photosynthesisers (especially in water, much more varied in prokaryotes than in eukaryotes: Cyclic phosphorylation: energy from electron transfer in ets harnessed to generate proton motive force (pmf, pmf used to generate atp (as in respiration, electrons eventually return to excitable molecule. Non-cyclic flow: electrons transferred to a carrier (e. g nadp+) & used for biosynthesis (e. g. co2 fixation, electrons replaces from an external electron donor ( photolysis" of evternal donor) Some generalities about photosynthesis: a membrane-localised process, light-harvesting antenna system chlorophylls (chl)/ bacteriochlorophylls (bchl) plus accessory pigments, transfers harvested energy to reaction centre: inc. Reaction centre chlorophyll/ bacteriochlorophyll": etc transfers excited electrons to energy carriers (or returns them to reaction centre chl/bchl) Model for antenna, and cyclic photophosphorylation in reaction centre of a purple bacterium.
