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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Rhizobium
Azotobacter
Beijerinckia

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

Rhodospirillum
Desulfotomaculum
Rhodomicrobium
Thiobacillus thiooxidans

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Microbiology of Soils
The diagnostic enzyme for denitrification is

none of these
nitro oxidoreductase
nitrate oxidase
nitrate reductase

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Microbiology of Soils
Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?

Both (a) and (b)
Chromaticum
Rhodomicrobium
Chlorobium

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

all of these
water
mold mycelium
minerals

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

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

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