Exercise: Microbiology Of Soils

Questions for: Microbiology Of Soils

The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as
A:
nitrification
B:
denitrification
C:
nitrogen fixation
D:
ammonification
Answer: B
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The population of algae in soil is __________ that of either bacteria or fungi.
A:
generally smaller than
B:
generally greater than
C:
equal to
D:
none of these
Answer: A
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The phenomenon of commensalism refers to a relationship between organisms in which
A:
one species of a pair benefits
B:
both the species of a pair benefit
C:
one species of a pair is more benefited
D:
none of the above
Answer: A
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Bacteria, as a group, are responsible for
A:
nitrogen oxidation
B:
sulfur oxidation
C:
nitrogen fixation
D:
all of these
Answer: D
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Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to
A:
slow growth
B:
medium growth
C:
fast growth
D:
none of these
Answer: A
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