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MCQs

Total Questions : 137 | Page 11 of 14 pages
Question 101. Which of the following is used for the proper maintenance and preservation of pure cultures?
  1.    Periodic transfer to fresh media
  2.    Preservation by overlaying cultures with mineral oil
  3.    Preservation by lyophilization
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Answer: (d).All of the above
Question 102. Cell size and cell number can be measured using
  1.    hemocytometer
  2.    coulter counter
  3.    petroff-hausser counting chamber
  4.    none of these
 Discuss Question
Answer: Option B. -> coulter counter
Answer: (b).coulter counter
Question 103. The solidifying agent commonly used in preparation of media is/are
  1.    both (a) and (b)
  2.    agar
  3.    silica gel
  4.    none of these
 Discuss Question
Answer: Option A. -> both (a) and (b)
Question 104. Cell size and cell number can be measured using
  1.    none of these
  2.    petroff-hausser counting chamber
  3.    hemocytometer
  4.    coulter counter
 Discuss Question
Answer: Option D. -> coulter counter
Question 105. Which of the following bacteria can grow in acidic pH?
  1.    Salmonella
  2.    Vibrio cholerae
  3.    Lactobacilli
  4.    Shigella
 Discuss Question
Answer: Option C. -> Lactobacilli
Question 106. Which of the following is used for the proper maintenance and preservation of pure cultures?
  1.    Periodic transfer to fresh media
  2.    Preservation by lyophilization
  3.    Preservation by overlaying cultures with mineral oil
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 107. In the process of freeze drying, a dense cell suspension is placed in small vials and is frozen at
  1.    -30 to -48°C
  2.    -20 to -30°C
  3.    -48 to -58°C
  4.    -60 to -78°C
 Discuss Question
Answer: Option D. -> -60 to -78°C
Question 108. Which of the following chemotherapeutic agents may affect the growth of Campylobacter jejuni?
  1.    Trimethoprim
  2.    Vacomycin
  3.    Polymyxin
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 109. The concentration of agar to obtain semi solid media is
  1.    0.5% or less
  2.    >10%
  3.    1.5-20%
  4.    >10%but
 Discuss Question
Answer: Option A. -> 0.5% or less
Question 110. To select cholera-causing bacterium, Vibrio cholerae, the pH of the medium is maintained at a pH of
  1.    6.79
  2.    8.90
  3.    8.5
  4.    3.5
 Discuss Question
Answer: Option C. -> 8.5

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