Microbiology of Soils
A heterocyst is

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

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

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

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