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Microbiology of Soils

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

ATP
ammonia
nitrate
glucose

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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

nitrogen fixation
ammonification
nitrification
denitrification

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

Desulfotomaculum
Thiobacillus thiooxidans
Rhodospirillum
Rhodomicrobium

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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
Streptomyces
Nocardia

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

nitrogen fixation
nitrogen oxidation
sulfur oxidation
all of these

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

generally greater than
none of these
generally smaller than
equal to

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