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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

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

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Rhizobium
Beijerinckia
Clostridium
Azotobacter

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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 energy value of biogas is typically

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

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Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Thiobacillus thiooxidans
Desulfotomaculum
Rhodomicrobium
Rhodospirillum

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

nitrate oxidase
nitrogenase
nitrate reductase
none of these

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