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Microbiology of Soils

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

ammonia
ATP
nitrate
glucose

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

Rhodospirillum
Desulfotomaculum
Thiobacillus thiooxidans
Rhodomicrobium

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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 crops which are involved in nitrogen fixation are

all of these
alfalfa and clover
soybean
bean and lupine

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Microbiology of Soils
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

Micromonospora
Streptomyces
Nocardia
all of these

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Microbiology of Soils
The energy value of biogas is typically

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

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