CBSE Class 10 Answered
respiration
Asked by isha007 | 26 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 | 30 Dec, 2009, 11:36: AM
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