Microbiology of Soils
The groups of symbiotic bacteria, which have the ability to fix nitrogen

these bacteria are from the genus, Rhizobium
grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen
All of these

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Microbiology of Soils
Syntrophism involves

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

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Microbiology of Soils
A heterocyst is

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

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Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

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

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