Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

Alcaligenes
Agrobacterium
Achromobacter
None of these

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Microbiology of Soils
A heterocyst is

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

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