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Microbiology of Soils

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

nitrogenase
none of these
nitrate oxidase
nitrate reductase

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Rhizobium
Azotobacter
Clostridium
Beijerinckia

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of mold
all of these
ingestion of fungi
ingestion of bacteria

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

Thiobacillus thiooxidans
Rhodospirillum
Rhodomicrobium
Desulfotomaculum

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

nitrate
ATP
glucose
ammonia

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

all of these
Micromonospora
Nocardia
Streptomyces

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