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MCQs

Total Questions : 49 | Page 4 of 5 pages
Question 31. . What is the colour of gram-negative bacteria on a gram staining?
  1.    Purple
  2.    Pink
  3.    Green
  4.    Colourless
 Discuss Question
Answer: Option B. -> Pink
Question 32. . What is the colour of gram -postive bacteria on a gram staining?
  1.    Purple
  2.    Pink
  3.    Colourless
  4.    Green
 Discuss Question
Answer: Option A. -> Purple
Question 33.  Production of acetoin can be detected by which of the following tests?
  1.    Citrate test
  2.    Voges-Proskauer test
  3.    Methyl red test
  4.    Indole test
 Discuss Question
Answer: Option B. -> Voges-Proskauer test
Question 34. .  The deinococci are gram-positive cocci and rods that are distinctive in their unusually great resistance to
  1.    radiation
  2.    desiccation
  3.    both (a) and (b)
  4.    extreme temperatures
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 35. . Which of the following is a primary stain for acid fast staining of mycobacteria?
  1.    Crystal violet
  2.    Carbol fuchsin
  3.    Geimsa
  4.    Methylene blue
 Discuss Question
Answer: Option B. -> Carbol fuchsin
Question 36. . Which of the following shows a positive urease test?
  1.    Proteus
  2.    Klebsiella
  3.    Both (a) and (b)
  4.    None of these
 Discuss Question
Answer: Option C. -> Both (a) and (b)
Question 37. . Which of the following(s) is/ are oxidase-positive bacteria?
  1.    Vibrio
  2.    Neisseria
  3.    Pseudomonas
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 38. . Which of the following organisms can be demonstrated with silver impregnation method?
  1.    Vibrios
  2.    Salmonella
  3.    Spirochaetes
  4.    Shigella
 Discuss Question
Answer: Option C. -> Spirochaetes
Question 39. . What is the order of reagents used in the Gram stain?
  1.    Crystal violet, iodine, safranin, decolorizer
  2.    Crystal violet, iodine, decolorizer, safranin
  3.    Safranin, crystal violet, decolorizer, iodine
  4.    Crystal violet, safranin, iodine, decolorizer
 Discuss Question
Answer: Option B. -> Crystal violet, iodine, decolorizer, safranin
Question 40. .  Which of the following(s) show(s) positive results for phenylalanine deaminase test?
  1.    Providencia
  2.    Proteus
  3.    Morganella
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these

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