Exercise: Microbiology Of Soils

Questions for: Microbiology Of Soils

Nitrogen oxidation (nitrification)refers to the
A:
conversion of ammonium ions into nitrates through the activities of certain bacteria.
B:
changing of atmospheric nitrogen (N2) to nitrogen compounds
C:
sulfur is oxidized to the sulfate form through Thiobacillus bacteria
D:
none of the above
Answer: A
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The groups of symbiotic bacteria, which have the ability to fix nitrogen
A:
derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen
B:
grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
C:
these bacteria are from the genus, Rhizobium
D:
all of the above
Answer: D
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A heterocyst is
A:
a type of spore
B:
a terminally differentiated cell that fixes nitrogen
C:
the progenitor of cyanobacterial vegetative cells
D:
a cell that carries out oxygenic photosynthesis
Answer: B
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The diagnostic enzyme for denitrification is
A:
nitrate reductase
B:
nitrate oxidase
C:
nitro oxidoreductase
D:
none of these
Answer: A
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Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into
A:
ammonia
B:
glucose
C:
ATP
D:
nitrate
Answer: A
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