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MCQs

Total Questions : 119 | Page 9 of 12 pages
Question 81. . During exponential growth, the growth rate is
  1.    number of generations per unit time
  2.    reciprocal of generation time
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option B. -> reciprocal of generation time
Question 82. .  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
Question 83. . The cell reproduction in bacteria may occur by
  1.    binary fission
  2.    budding
  3.    fragmentation
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 84. . 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
Question 85. . A culture broth tube was very turbid at the surface but clear throughout the rest of the tube indicating that the
  1.    organism are aerobes
  2.    organism should be grown in an anaerobic chamber
  3.    organism cannot produce superoxide dismutase and/or catalase
  4.    organism cannot tolerate oxygen
 Discuss Question
Answer: Option A. -> organism are aerobes
Question 86. . 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
Question 87. . A synergistic effect is observed when
  1.    one organism removes an inhibitory substance for another
  2.    one organism produces a growth factor utilized by another
  3.    microbial alteration of pH, aw, Eh favours the growth of another
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 88. . The microorganisms that grow best in a low-oxygen environment is called a (n)
  1.    aerobe
  2.    anaerobe
  3.    facultative
  4.    microaerophile
 Discuss Question
Answer: Option D. -> microaerophile
Question 89. . 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)
Question 90. . Generation time is
  1.    time required for the population to double
  2.    time required for the initial adjustment
  3.    obtained by expression t/n, where t = time interval, n = number of generation
  4.    both (a) and (c)
 Discuss Question
Answer: Option D. -> both (a) and (c)

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