Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

medium growth
none of these
slow growth
fast growth

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Microbiology of Soils
Nitrogen fixation by the microorganisms can be detected by adopting the approach of

demonstrating growth in a nitrogen free medium
All of these
measuring15N2 by mass spectrometer
cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen

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Microbiology of Soils
Denitrification is

reduction of nitrate (NO3-) to nitrogen gas
reduction of nitrate to organic nitrogen compounds
both (a) and (b)
changing of atmospheric nitrogen (N2) to nitrogen compounds

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