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

Rhodospirillum
Rhodomicrobium
Desulfotomaculum
Thiobacillus thiooxidans

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Microbiology of Soils
A heterocyst is

a type of spore
a cell that carries out oxygenic photosynthesis
the progenitor of cyanobacterial vegetative cells
a terminally differentiated cell that fixes nitrogen

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