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MCQs

Total Questions : 119 | Page 3 of 12 pages
Question 21. During exponential growth, the growth rate is
  1.    both (a) and (b)
  2.    number of generations per unit time
  3.    none of these
  4.    reciprocal of generation time
 Discuss Question
Answer: Option D. -> reciprocal of generation time
Question 22. The cell reproduction in bacteria may occur by
  1.    all of these
  2.    binary fission
  3.    budding
  4.    fragmentation
 Discuss Question
Answer: Option A. -> all of these
Question 23. Starvation proteins are produced by a culture during which of the following segments of the growth curve?
  1.    Death phase
  2.    Stationary phase
  3.    Lag phase
  4.    Exponential phase
 Discuss Question
Answer: Option B. -> Stationary phase
Question 24. A spore differs from an actively replicating bacterium in that the spore
  1.    is metabolically inactive
  2.    All of these
  3.    is able to withstand more extreme conditions than the replicating cell
  4.    is produced during a process involving asymmetric division
 Discuss Question
Answer: Option B. -> All of these
Question 25. The reproduction by budding occur in
  1.    Both (a) and (b)
  2.    Hyphomicrobium vulgare
  3.    Rhodopseudomonas acidophila
  4.    Bacillus subtilis
 Discuss Question
Answer: Option A. -> Both (a) and (b)
Question 26. Antimicrobial constituents for the microbial growth in foods are
  1.    extrinsic factor
  2.    both (a) and (b)
  3.    none of these
  4.    intrinsic factor
 Discuss Question
Answer: Option D. -> intrinsic factor
Question 27. Which of the following has more tolerance for acidic pH (lower pH)?
  1.    Bacteria
  2.    None of these
  3.    E. coli
  4.    Yeast and moulds
 Discuss Question
Answer: Option D. -> Yeast and moulds
Question 28. The ability of Vibrio fischeri to produce bioluminescence chemicals only when a certain population density has been reached is an example of
  1.    quorum sensing
  2.    Shelford's law of tolerance
  3.    Heisenberg's principle of uncertainty
  4.    Liebig's law of the minimum
 Discuss Question
Answer: Option A. -> quorum sensing
Question 29. A culture broth tube was very turbid at the surface but clear throughout the rest of the tube indicating that the
  1.    organism should be grown in an anaerobic chamber
  2.    organism cannot produce superoxide dismutase and/or catalase
  3.    organism cannot tolerate oxygen
  4.    organism are aerobes
 Discuss Question
Answer: Option D. -> organism are aerobes
Question 30. The average size of cells during the exponential phase of growth is
  1.    equal to the lag phase
  2.    lesser than the lag phase
  3.    none of these
  4.    greater than the lag phase
 Discuss Question
Answer: Option B. -> lesser than the lag phase

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