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Microbiology of Soils

Microbiology of Soils
The nitrogenase consists of

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

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Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

Clostridium
All of these
considerably less important in comparison to the symbiotic bacteria
Azotobacter

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

generally greater than
none of these
equal to
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 bacteria
all of these
ingestion of fungi
ingestion of mold

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

sulfur oxidation
all of these
nitrogen oxidation
nitrogen fixation

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Microbiology of Soils
Which of the following is capable of oxidizing sulfur to sulfates?

Desulfotomaculum
Thiobacillus thiooxidans
Rhodospirillum
Rhodomicrobium

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