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MCQs

Total Questions : 348 | Page 3 of 35 pages
Question 21. Pseudomonas maltophilia is a fluorescent species.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 22. Which group of bacteria among the following give a positive reaction by the oxidase test?
  1.    Spirochetes
  2.    Aerobic/Microaerophilic, Motile,Helical/Vibroid,Gram-negative bacteria
  3.    Non-motile,Gram-negative, Curved bacteria
  4.    Aerobic,Gram-negative rods and cocci
 Discuss Question
Answer: Option B. -> Aerobic/Microaerophilic, Motile,Helical/Vibroid,Gram-negative bacteria
Answer: (b).Aerobic/Microaerophilic, Motile,Helical/Vibroid,Gram-negative bacteria
Question 23. Pseudomonas bacteria uses which of the following as an electron acceptor for anaerobic respiration?
  1.    Oxygen
  2.    Nitrate
  3.    Phosphate
  4.    Sulphate
 Discuss Question
Answer: Option B. -> Nitrate
Answer: (b).Nitrate
Question 24. Pyocyanin, a blue water-soluble pigment is produced by which of the following pseudomonads?
  1.    P.mallei
  2.    P.syringae
  3.    P.fluorescens
  4.    P.aeruginosa
 Discuss Question
Answer: Option D. -> P.aeruginosa
Answer: (d).P.aeruginosa
Question 25. Which of the following are important plant pathogens?
  1.    P. aeruginosa
  2.    P.maltophilia
  3.    P.syringae
  4.    P.pseudomallei
 Discuss Question
Answer: Option C. -> P.syringae
Answer: (c).P.syringae
Question 26. 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
Answer: (a).0.5% sulphuric acid
Question 27. 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
Answer: (d).A mixture of ethyl alcohol and acetone
Question 28. 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
Answer: (c).crystal violet
Question 29. 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
Answer: (b).Voges-Proskauer test
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
Answer: (b).Methyl red test

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