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Microbiology of Soils

Microbiology of Soils
Assimilative denitrification is done by

plants
all of these
fungi
prokaryotes

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Microbiology of Soils
Which of the following statement is not true about composition of biogas?

It is composed almost exclusively of methane and carbon dioxide
It also contains with traces of O2 and Cl2
Both (a) and (b)
It also contains with traces of H2S, N2, H2and CO

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitrate oxidase
nitro oxidoreductase
none of these
nitrate reductase

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Microbiology of Soils
The diagnostic enzyme for nitrogen-fixing organisms is

nitrogenase
nitrate reductase
nitrate oxidase
none of these

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Microbiology of Soils
Bacteria, as a group, are responsible for

nitrogen fixation
sulfur oxidation
all of these
nitrogen oxidation

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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

slow growth
fast growth
none of these
medium growth

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