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Microbiology Objective Questions { Growth and Nutrition of Bacteria }

29. 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
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30. 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
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31. 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
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32. Generation time is
A.time required for the population to double
B.time required for the initial adjustment
C.obtained by expression t/n, where t = time interval, n = number of generation
D.both (a) and (c)
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33. The term facultative anaerobe refers to an organism that
A.doesn't use oxygen but tolerates it
B.is killed by oxygen
C.uses oxygen when present or grows without oxygen when absent
D.requires less oxygen than is present in air
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34. The microorganisms that grow best in a low-oxygen environment is called a (n)
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35. Pseudomonas pseudoflava can grow as
C.both (a) and (b)
D.none of these
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