Exercise: Growth And Nutrition Of Bacteria

Questions for: Growth And Nutrition Of Bacteria

A synergistic effect is observed when
A:
one organism removes an inhibitory substance for another
B:
one organism produces a growth factor utilized by another
C:
microbial alteration of pH, aw, Eh favours the growth of another
D:
all of the above
Answer: D
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A culture broth tube was very turbid at the surface but clear throughout the rest of the tube indicating that the
A:
organism are aerobes
B:
organism should be grown in an anaerobic chamber
C:
organism cannot produce superoxide dismutase and/or catalase
D:
organism cannot tolerate oxygen
Answer: A
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The average size of cells during the exponential phase of growth is
A:
greater than the lag phase
B:
lesser than the lag phase
C:
equal to the lag phase
D:
none of these
Answer: B
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Antimicrobial constituents for the microbial growth in foods are
A:
intrinsic factor
B:
extrinsic factor
C:
both (a) and (b)
D:
none of these
Answer: A
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The ability of Vibrio fischeri to produce bioluminescence chemicals only when a certain population density has been reached is an example of
A:
Liebig's law of the minimum
B:
Shelford's law of tolerance
C:
quorum sensing
D:
Heisenberg's principle of uncertainty
Answer: C
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