Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

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

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Microbiology of Soils
A heterocyst is

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

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Microbiology of Soils
Syntrophism involves

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

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Microbiology of Soils
Nitrogen fixation

changes the free nitrogen (N2) to a form usable by plants
especially changes nitrogen compounds, mostly amines such as NH2
both (a) and (b)
fix the free nitrogen (N2) by which it should not be usable by plants

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