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Microbiology of Soils

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

glucose
ATP
nitrate
ammonia

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

minerals
all of these
water
mold mycelium

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

one species of a pair is more benefited
None of these
both the species of a pair benefit
one species of a pair benefits

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

sulfur oxidation
nitrogen oxidation
nitrogen fixation
all of these

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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?

Alcaligenes
Achromobacter
None of these
Agrobacterium

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Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

equal to
generally greater than
generally smaller than
none of these

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