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MCQs

Total Questions : 137 | Page 13 of 14 pages
Question 121. Which of the following techniques may be performed quantitatively to determine the number of bacteria of a particular type?
  1.    Both (a) and (b)
  2.    Spread plate
  3.    Streak plate technique
  4.    Pour plate
 Discuss Question
Answer: Option A. -> Both (a) and (b)
Question 122. Which of the following problem makes it impossible to satisfy all of Koch's postulates?
  1.    Microorganism causes serious symptoms in humans
  2.    Genes from the microorganism cannot be amplified by PCR
  3.    Microorganism cannot be isolated in pure culture
  4.    Species of microorganism is in question
 Discuss Question
Answer: Option C. -> Microorganism cannot be isolated in pure culture
Question 123. A medium containing crystal violet dye plus sodium deoxycholate will allow
  1.    none of these
  2.    gram (-)ve intestinal bacteria to grow
  3.    gram (+)ve intestinal bacteria to grow
  4.    aquatic bacteria to grow
 Discuss Question
Answer: Option B. -> gram (-)ve intestinal bacteria to grow
Question 124. Which of the following bacteria can grow in alkaline pH?
  1.    Vibrio cholerae
  2.    Shigella
  3.    Salmonella
  4.    Lactobacilli
 Discuss Question
Answer: Option A. -> Vibrio cholerae
Question 125. Which of the following methods is most likely to be quantitative?
  1.    Wet mount
  2.    Dilution and plating
  3.    None of these
  4.    Gram staining
 Discuss Question
Answer: Option B. -> Dilution and plating
Question 126. When a substance is added to a liquid medium which inhibits the growth of unwanted bacteria and favors the growth of wanted bacteria, it is known as
  1.    enriched medium
  2.    selective medium
  3.    enrichment medium
  4.    differential medium
 Discuss Question
Answer: Option C. -> enrichment medium
Question 127. All bacteria that inhabit the human body are
  1.    chemolithotrophs
  2.    phototroph
  3.    heterotrophs
  4.    autotrophs
 Discuss Question
Answer: Option C. -> heterotrophs
Question 128. Which of the following hint(s) suggest/s that a given specimen is likely to contain anaerobic bacteria?
  1.    All of these
  2.    Presence of sulphur granules
  3.    Foul odour
  4.    Gas in specimen
 Discuss Question
Answer: Option A. -> All of these
Question 129. In the pour plate method, the mixed culture is diluted directly in tubes of
  1.    liquid agar medium
  2.    both (a) and (b)
  3.    none of these
  4.    sterile liquid usually water
 Discuss Question
Answer: Option A. -> liquid agar medium
Question 130. Viable plate count can be obtained using
  1.    both (a) and (b)
  2.    Spread plate method
  3.    Pour plate method
  4.    Hemocytometer
 Discuss Question
Answer: Option A. -> both (a) and (b)

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