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Microbiology of Soils

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

nitrate reductase
none of these
nitrogenase
nitrate oxidase

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitrate reductase
nitrate oxidase
none of these
nitro oxidoreductase

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Microbiology of Soils
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as

ammonification
denitrification
nitrogen fixation
nitrification

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

Thiobacillus thiooxidans
Desulfotomaculum
Rhodospirillum
Rhodomicrobium

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

nitrogen fixation
sulfur oxidation
nitrogen oxidation
all of these

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Microbiology of Soils
The crops which are involved in nitrogen fixation are

alfalfa and clover
bean and lupine
soybean
all of these

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