Asked by isha007 | 26th Dec, 2009, 11:12: AM

Expert Answer:

Some organisms like bacteria utilize certain inorganic exogenous electron acceptors in their electron transport chain instead of oxygen and, therefore, respire anaerobically. The major electron acceptors are nitrate (NO3-), sulphate (SO42-), CO2, Fe3+, SeO42+, etc. 
Nitrate is reduced to nitrite, nitrous oxide or molecular nitrogen in certain anerobes and sulphate is reduced to sulphide in others. In a parallel series of reactions in other organisms, CO2 is used as electron acceptor and reduced to methane or acetic acid during oxidation of hydrogen.

Answered by  | 30th Dec, 2009, 11:36: AM

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