Microbiology of Soils
A heterocyst is

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

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Microbiology of Soils
Denitrification is

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

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