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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Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

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

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