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MCQs

Total Questions : 348 | Page 5 of 35 pages
Question 41. A spore differs from an actively replicating bacterium in that the spore
  1.    is produced during a process involving asymmetric division
  2.    is able to withstand more extreme conditions than the replicating cell
  3.    is metabolically inactive
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 42. The ability of Vibrio fischeri to produce bioluminescence chemicals only when a certain population density has been reached is an example of
  1.    Liebig's law of the minimum
  2.    Shelford's law of tolerance
  3.    quorum sensing
  4.    Heisenberg's principle of uncertainty
 Discuss Question
Answer: Option C. -> quorum sensing
Answer: (c).quorum sensing
Question 43. Which of the following has more tolerance for acidic pH (lower pH)?
  1.    Yeast and moulds
  2.    Bacteria
  3.    E. coli
  4.    None of these
 Discuss Question
Answer: Option A. -> Yeast and moulds
Answer: (a).Yeast and moulds
Question 44. Antimicrobial constituents for the microbial growth in foods are
  1.    intrinsic factor
  2.    extrinsic factor
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option A. -> intrinsic factor
Answer: (a).intrinsic factor
Question 45. The average size of cells during the exponential phase of growth is
  1.    greater than the lag phase
  2.    lesser than the lag phase
  3.    equal to the lag phase
  4.    none of these
 Discuss Question
Answer: Option B. -> lesser than the lag phase
Answer: (b).lesser than the lag phase
Question 46. Pseudomonas pseudoflava can grow as
  1.    chemo-lithotrophs
  2.    chemo-organotrophs
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
Question 47. Which of the following is the suitable temperature range for mesophiles?
  1.    20-30°C
  2.    25-40°C
  3.    >40°C
  4.    None of these
 Discuss Question
Answer: Option B. -> 25-40°C
Answer: (b).25-40°C
Question 48. Exponential phase of growth curve of bacteria is of limited duration because of
  1.    rise in cell density
  2.    accumulation of toxic metabolites
  3.    exhaustion of nutrients
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 49. In the exponential phase, the cells and cell mass
  1.    first increases then decreases
  2.    decreases
  3.    are constant
  4.    double at a constant rate
 Discuss Question
Answer: Option D. -> double at a constant rate
Answer: (d).double at a constant rate
Question 50. A culture broth tube was very turbid at the bottom of the tube but clear at the top of the tube indicating that the
  1.    broth is sterile
  2.    organism can tolerate oxygen
  3.    organism cannot produce superoxide dismutase and/or catalase
  4.    organism should be grown in an anaerobic chamber
 Discuss Question
Answer: Option C. -> organism cannot produce superoxide dismutase and/or catalase
Answer: (c).organism cannot produce superoxide dismutase and/or catalase

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