Microbiology of Soils
Denitrification is

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

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Microbiology of Soils
A heterocyst is

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

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