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Microbiology of Soils

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

nitrate oxidase
nitrogenase
nitrate reductase
none of these

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitrate reductase
nitro oxidoreductase
none of these
nitrate oxidase

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Cyanobacteia
De-nitrifying bacteria
Nitrifying bacteria
Pectin decomposing bacteria

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Microbiology of Soils
The microbial ecosystem of soil includes

abiotic components of soil
biotic components of soil
biotic and abiotic components of soil
None of these

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

both the species of a pair benefit
None of these
one species of a pair benefits
one species of a pair is more benefited

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

all of these
sulfur oxidation
nitrogen oxidation
nitrogen fixation

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