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Microbiology of Soils

Microbiology of Soils
The physical structure of soil is improved by the accumulation of

water
all of these
minerals
mold mycelium

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Microbiology of Soils
The energy value of biogas is typically

400-700 BTU/ft3
1500 BTU/ft3
1,000 BTU/ft3
more than 5000 BTU/ft3

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

none of these
nitrate reductase
nitrogenase
nitrate oxidase

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

Thiobacillus thiooxidans
Desulfotomaculum
Rhodomicrobium
Rhodospirillum

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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
nitrification
nitrogen fixation
denitrification

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