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Microbiology of Soils

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

all of these
nitrogen fixation
nitrogen oxidation
sulfur oxidation

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Microbiology of Soils
In the process of nitrogen fixation, which of the following microorganism is involved?

Non symbiotic and symbiotic microorganisms only
Symbiotic microorganisms only
None of these
Non symbiotic microorganisms only

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

generally smaller than
equal to
generally greater than
none of these

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Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

Alcaligenes
Agrobacterium
Achromobacter
None of these

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

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

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Microbiology of Soils
The diagnostic enzyme for denitrification is

none of these
nitro oxidoreductase
nitrate oxidase
nitrate reductase

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