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Microbiology of Soils

Microbiology of Soils
Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into

ATP
glucose
ammonia
nitrate

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

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

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Microbiology of Soils
Denitrification may be distinguished as

both (a) and (b)
blue baby syndrome
dissimilative
assimilative

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Microbiology of Soils
The diagnostic enzyme for denitrification is

none of these
nitrate oxidase
nitrate reductase
nitro oxidoreductase

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Microbiology of Soils
Denitrification is carried out

All of these
predominantly by Pseudomonas spp
predominantly by Bacillus spp
usually by facultative anaerobes

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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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