BIOC17H3 Lecture 7: LECTURE-7-c17

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So: from pyruvate, microbes can produce many diff. products: create ethanol, lactate, propionate, acetate etc. In anoxic environments, we typically have prokaryotes who do this: these are obligate anaerobes, prokaryotes in generally can be however: obligate anaerobes/aerobes or can be facultative. In prokaryotes that undergo anaerobic respiration, they have exogenous terminal e- acceptors that are different than o2: glycolysis and the tca cycle feed e- into different etc carriers, than those for aerobic respiration, most atp comes from etc. Fadh2 and nadh will give their electrons to etc that is different from the one in aerobic respiration. The final acceptor for this electron will be an exogenous molecule which will be different than oxygen. For that reason, metabolic product is not going to be water which means that the yield in atp is not going to be the same like in aerobic respiration. Facultative anerobes can switch between 2 different etc depending on the availability of o2.

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