Microbiology of Soils
Denitrification is carried out

usually by facultative anaerobes
predominantly by Bacillus spp
All of these
predominantly by Pseudomonas spp

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Microbiology of Soils
A heterocyst is

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

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