Respiration using electron acceptors other than oxygen
Not to be confused with Fermentation.
Anaerobic respiration is respiration using electron acceptors other than molecular oxygen (O2). Although oxygen is not the final electron acceptor, the process still uses a respiratory electron transport chain.[1]
In aerobic organisms undergoing respiration, electrons are shuttled to an electron transport chain, and the final electron acceptor is oxygen. Molecular oxygen is an excellent electron acceptor. Anaerobes instead use less-oxidizing substances such as nitrate (NO− 3), fumarate (C 4H 2O2− 4), sulfate (SO2− 4), or elemental sulfur (S). These terminal electron acceptors have smaller reduction potentials than O2. Less energy per oxidized molecule is released. Therefore, anaerobic respiration is less efficient than aerobic.
^Slonczewski, Joan L.; Foster, John W. (2011). Microbiology: An Evolving Science (2nd ed.). New York: W.W. Norton. p. 166. ISBN 9780393934472.
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