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Microbiology Objective Questions { Growth and Nutrition of Bacteria }

22. Starvation proteins are produced by a culture during which of the following segments of the growth curve?
A.Lag phase
B.Exponential phase
C.Stationary phase
D.Death phase
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23. The cell reproduction in bacteria may occur by
A.binary fission
D.all of these
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24. During exponential growth, the growth rate is
A.number of generations per unit time
B.reciprocal of generation time
C.both (a) and (b)
D.none of these
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25.  A spore differs from an actively replicating bacterium in that the spore
A.is produced during a process involving asymmetric division
B.is able to withstand more extreme conditions than the replicating cell
C.is metabolically inactive
D.all of the above
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26. Which of the following has more tolerance for acidic pH (lower pH)?
A.Yeast and moulds
C.E. coli
D.None of these
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27.  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
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28. Antimicrobial constituents for the microbial growth in foods are
A.intrinsic factor
B.extrinsic factor
C.both (a) and (b)
D.none of these
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