Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

none of these
generally smaller than
generally greater than
equal to

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Microbiology of Soils
Syntrophism involves

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

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Microbiology of Soils
Nitrogen fixation by the microorganisms can be detected by adopting the approach of

cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
demonstrating growth in a nitrogen free medium
All of these
measuring15N2 by mass spectrometer

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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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Microbiology of Soils
A heterocyst is

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

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