Microbiology of Soils
Syntrophism involves

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

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Microbiology of Soils
A heterocyst is

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

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Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

sulfur is oxidized to the sulfate form through Thiobacillus bacteria
changing of atmospheric nitrogen (N2) to nitrogen compounds
conversion of ammonium ions into nitrates through the activities of certain bacteria.
None of these

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