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Microbiology of Soils

Microbiology of Soils
The diagnostic enzyme for denitrification is

nitro oxidoreductase
nitrate oxidase
none of these
nitrate reductase

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Rhizobium
Beijerinckia
Clostridium
Azotobacter

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of bacteria
ingestion of fungi
all of these
ingestion of mold

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Microbiology of Soils
The microbial ecosystem of soil includes

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

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Microbiology of Soils
The physical structure of soil is improved by the accumulation of

water
minerals
all of these
mold mycelium

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Microbiology of Soils
The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

All of these
Hydrolytic
methanogenic
Transitional

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