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Unformatted text preview: Electron transport, chemiosmotic ATP production, fermentation In bacteria capable of respiration, the electrons carried by NADH and FADH 2 can be used for further ATP synthesis via oxidative phosphorylation- Respiratory electron transport chains consist of a series of membrane-bound carrier molecules that cycle between reduced and oxidized states (Tortora et al., Figure 5.13) = Among the carrier molecules are flavoproteins and cytochromes = Some of the carriers pick up protons from the cytoplasm when they are reduced and release them to the outside of the membrane when they are oxidized; this the way that the characteristic proton gradient is produced- In the final step of electron transport, electrons are transferred to a terminal electron acceptor = In aerobic respiration, this terminal electron acceptor is O 2 = In anaerobic respiration, this terminal electron acceptor may be nitrate or sulfate- Because electron transport produces ATP through oxidative phosphorylation, we can look at the...
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