Microbiology of Soils
A heterocyst is

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

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Microbiology of Soils
Syntrophism involves

exchange of nutrients among species
exchange of nutrients between two species
no exchange of nutrients among species
no exchange of nutrients between two species

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