Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Rhodomicrobium
Thiobacillus thiooxidans
Desulfotomaculum
Rhodospirillum

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Microbiology of Soils
Denitrification is

changing of atmospheric nitrogen (N2) to nitrogen compounds
reduction of nitrate (NO3-) to nitrogen gas
reduction of nitrate to organic nitrogen compounds
both (a) and (b)

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