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MCQs

Total Questions : 49 | Page 3 of 5 pages
Question 21. The process of Gram staining is based on the ability of bacterial cell wall
  1.    to retain the safranin dye
  2.    none of above
  3.    to retain the crystal violet dye during solvent treatment.
  4.    to retain part of both dyes
 Discuss Question
Answer: Option C. -> to retain the crystal violet dye during solvent treatment.
Question 22.  Catalase production is negative in which of the following?
  1.    Streptococcus
  2.    Salmonella
  3.    Proteus
  4.    Staphylococcus
 Discuss Question
Answer: Option A. -> Streptococcus
Question 23.  The gram-negative organisms is
  1.    Actinomyces
  2.    Bacillus
  3.    Clostridium
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 24.  The primary stain of Gram's method is
  1.    safranin
  2.    phenolpthalene
  3.    crystal violet
  4.    methyl red
 Discuss Question
Answer: Option C. -> crystal violet
Question 25.  The organisms that can be acid-fast stained is
  1.    Nocardia
  2.    Tubercle bacilli
  3.    Lepra bacilli
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 26.  
Which of the following inference(s) indicate(s) the ability of an organism to utilize citrate as a sole source of carbon in Simmon's citrate medium?
  1.    Blue colour
  2.    Appearance of growth
  3.    Both (a) and (b)
  4.    None of these
 Discuss Question
Answer: Option C. -> Both (a) and (b)
Question 27.  At what concentration of sulphuric acid, Nocardia resists decolourization?
  1.    0.5% sulphuric acid
  2.    5% sulphuric acid
  3.    10% sulphuric acid
  4.    8% sulphuric acid
 Discuss Question
Answer: Option A. -> 0.5% sulphuric acid
Question 28.  Which of the following is a substitute for crystal violet used in gram-staining procedure?
  1.    Methylene blue
  2.    Bromocresol green
  3.    Safranin
  4.    Phenolpthalene
 Discuss Question
Answer: Option A. -> Methylene blue
Question 29.  Which of the following is commonly used as Gram's decolouriser?
  1.    Ethyl alcohol
  2.    Methyl alcohol
  3.    Acetone
  4.    A mixture of ethyl alcohol and acetone
 Discuss Question
Answer: Option D. -> A mixture of ethyl alcohol and acetone
Question 30. . The production of sufficient acid by fermentation of glucose leads to decrease in pH such that pH of the medium falls below 4.5. Which of the following test can detect it?
  1.    Indole test
  2.    Methyl red test
  3.    Citrate utilization test
  4.    Voges-Proskauer test
 Discuss Question
Answer: Option B. -> Methyl red test

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