Microbiology of Soils
Which of the following is capable of oxidizing sulfur to sulfates?

Thiobacillus thiooxidans
Desulfotomaculum
Rhodomicrobium
Rhodospirillum

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Microbiology of Soils
Syntrophism involves

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

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Microbiology of Soils
A heterocyst is

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

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

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

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