Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

none of these
fast growth
slow growth
medium growth

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Microbiology of Soils
A heterocyst is

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

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