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Microbiology of Soils

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

nitrate oxidase
nitrogenase
none of these
nitrate reductase

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

nitrogen fixation
all of these
nitrogen oxidation
sulfur oxidation

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Microbiology of Soils
The nitrogenase consists of

both (a) and (b)
dinitrogenase
none of these
dinitrogenase reductase

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Microbiology of Soils
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

Streptomyces
Micromonospora
all of these
Nocardia

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Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

generally greater than
equal to
none of these
generally smaller than

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

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

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