Question

You have isolated a bacterium that grows in a medium containing an organic substrate and nitrate in the absence of oxygen. the nitrate is reduced to nitrite. you can be sure that this bacterium is?

Answer 1

The reduction of the nitrate back into the nitrogen in the soil is called as denitrification. This process is also performed by the bacteria like Pseudomonas, Clostridium  

In the bacterial species and the Paracoccus the denitrificans engages in the denitrification under the both oxic and the anoxic conditions and simultaneously. Upon the oxygen the exposure, the bacteria is also able to utilize the nitrous oxide reductase, an the enzyme and that catalyzes the last step in denitrification

Denitrification is the reduction of the NO3− → NO2− → NO → N2O → N2 and gas that is also mediated by the bacteria under the anaerobic conditions, and most generally in all the microbial mats and sediments.

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