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Microbiology of Soils

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

nitrate
ammonia
glucose
ATP

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

nitrogen oxidation
all of these
nitrogen fixation
sulfur oxidation

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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
all of these
Nocardia
Streptomyces

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

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

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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

nitrification
denitrification
ammonification
nitrogen fixation

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Nitrifying bacteria
Cyanobacteia
De-nitrifying bacteria
Pectin decomposing bacteria

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