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

Desulfotomaculum
Rhodospirillum
Rhodomicrobium
Thiobacillus thiooxidans

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Microbiology of Soils
Nitrogen fixation

both (a) and (b)
especially changes nitrogen compounds, mostly amines such as NH2
fix the free nitrogen (N2) by which it should not be usable by plants
changes the free nitrogen (N2) to a form usable by plants

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