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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Rhizobium
Azotobacter
Clostridium
Beijerinckia

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

all of these
nitrogen oxidation
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
Nocardia
all of these
Streptomyces

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

Desulfotomaculum
Rhodospirillum
Thiobacillus thiooxidans
Rhodomicrobium

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

none of these
generally smaller than
generally greater than
equal to

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

mold mycelium
all of these
water
minerals

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