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MCQs

Total Questions : 119 | Page 6 of 12 pages
Question 51. The term obligate anaerobe refers to an organism that
  1.    is killed by oxygen
  2.    doesn't use oxygen but tolerates it
  3.    uses oxygen when present or grows without oxygen when oxygen is absent
  4.    prefers to grow without oxygen
 Discuss Question
Answer: Option A. -> is killed by oxygen
Question 52. The term aerotolerant anaerobe refers to an organism that
  1.    prefers to grow without oxygen
  2.    is killed by oxygen
  3.    doesn't use oxygen but can grow in the presence of oxygen
  4.    requires less oxygen than is present in air
 Discuss Question
Answer: Option C. -> doesn't use oxygen but can grow in the presence of oxygen
Question 53. The period between inoculation of bacteria in a culture medium and beginning of multiplication is known as
  1.    log phase
  2.    stationary phase
  3.    decline phase
  4.    lag phase
 Discuss Question
Answer: Option D. -> lag phase
Question 54. Microaerophilic bacteria are those which require
  1.    oxygen for activation of enzymes
  2.    None of these
  3.    21 % oxygen for growth
  4.    low levels of oxygen for growth (lesser than O2 present in atmosphere)
 Discuss Question
Answer: Option D. -> low levels of oxygen for growth (lesser than O2 present in atmosphere)
Question 55. An organism is completely dependent on atmospheric O2 for growth. This organism is
  1.    obligate aerobe
  2.    osmotolerant
  3.    facultative anaerobe
  4.    acidophile
 Discuss Question
Answer: Option A. -> obligate aerobe
Question 56. The fragmentation occurs in
  1.    None of these
  2.    Bacillus subtilis
  3.    Nocardia species
  4.    Streptomyces species
 Discuss Question
Answer: Option C. -> Nocardia species
Question 57.  Generation time of Escherichia coli is
  1.    20 minutes
  2.    20 hours
  3.    20 days
  4.    200 hours
 Discuss Question
Answer: Option A. -> 20 minutes
Question 58.  Nutrient content and biological structures are considered as
  1.    implicit factor for microbial growth
  2.    intrinsic factor for microbial growth
  3.    processing factor
  4.    none of the above
 Discuss Question
Answer: Option B. -> intrinsic factor for microbial growth
Question 59.  Implicit factors
  1.    depend on developing microflora
  2.    can be synergistic
  3.    both (a) and (b)
  4.    none of the above
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 60.  Which of the following is not the characteristic of a growth curve?
  1.    Shows development of microbial population under relatively stable environmental conditions
  2.    Plotted with logarithmic numbers
  3.    Graphs numbers of microbes versus time
  4.    Each growth curve consists of four distinct phases
 Discuss Question
Answer: Option D. -> Each growth curve consists of four distinct phases

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