Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Cyanobacteia
Nitrifying bacteria
Pectin decomposing bacteria
De-nitrifying bacteria

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Microbiology of Soils
A heterocyst is

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

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