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Microbiology of Soils

Microbiology of Soils
Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?

Both (a) and (b)
Chlorobium
Chromaticum
Rhodomicrobium

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

sulfur oxidation
nitrogen fixation
nitrogen oxidation
all of these

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Microbiology of Soils
The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

All of these
Hydrolytic
Transitional
methanogenic

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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?

Agrobacterium
None of these
Alcaligenes
Achromobacter

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

nitrate reductase
none of these
nitrate oxidase
nitrogenase

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

all of these
alfalfa and clover
soybean
bean and lupine

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