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Microbiology of Soils

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

Chromaticum
Rhodomicrobium
Both (a) and (b)
Chlorobium

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

Rhodomicrobium
Rhodospirillum
Desulfotomaculum
Thiobacillus thiooxidans

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Microbiology of Soils
The diagnostic enzyme for nitrogen-fixing organisms is

nitrate reductase
nitrate oxidase
none of these
nitrogenase

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Microbiology of Soils
The nitrogenase consists of

both (a) and (b)
dinitrogenase reductase
dinitrogenase
none of these

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

both (a) and (b)
nonsymbiotic
none of these
symbiotic

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

minerals
water
mold mycelium
all of these

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