Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

sulfur is oxidized to the sulfate form through Thiobacillus bacteria
conversion of ammonium ions into nitrates through the activities of certain bacteria.
changing of atmospheric nitrogen (N2) to nitrogen compounds
None of these

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Microbiology of Soils
A heterocyst is

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

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