Spirochetes And Enterobacteriaceae(Microbiology ) Questions and Answers

Question 1.  
Which of the following serotypes of Salmonella does not produce H2S?
  1.    S choleraesuis
  2.    S paratyphi A
  3.    Both (a) and (b)
  4.    None of these
Explanation:-
Answer: Option C. -> Both (a) and (b)
Question 2.  Which of the following media is selective for Salmonella?
  1.    Thiosulphate citrate bile salt agar
  2.    Wilson and Blair's brilliant-green bismuth sulphite agar medium
  3.    Bile salt agar
  4.    All of the above
Explanation:-
Answer: Option B. -> Wilson and Blair's brilliant-green bismuth sulphite agar medium
Question 3.  Which of the following is the commonest species of Salmonella for causing zoonotic disease?
  1.    S Indiana
  2.    S newport
  3.    S typhimurium
  4.    S enteritidis
Explanation:-
Answer: Option C. -> S typhimurium
Question 4.  Xylose lysine deoxycholate (XLD) agar is better selective medium than the deoxycholate citrate agar (DCA) because
  1.    it is selective
  2.    it imparts better growth
  3.    it contains high salt concentration
  4.    it is less inhibitory to S. Dysentriae and S. flexneri
Explanation:-
Answer: Option D. -> it is less inhibitory to S. Dysentriae and S. flexneri
Question 5.  Which of the following property(ies) is/are seen in the members of family Enterobacteriaceae?
  1.    They are catalase-positive
  2.    They are oxidase-negative
  3.    They ferment glucose
  4.    They reduce nitrates to nitrites
Explanation:-
Answer: Option B. -> They are oxidase-negative
Question 6.  Dysentery may be caused by
  1.    enteropathogenic Escherichia coli
  2.    enteroinvasive E. coli
  3.    enterotoxigenic E. coli
  4.    verotoxigenic E. coli
Explanation:-
Answer: Option C. -> enterotoxigenic E. coli
Question 7.  Which of the following(s) bacteria belong to the family Entero-bacteriaceae?
  1.    Yersinia
  2.    Shigella
  3.    Salmonella
  4.    All of these
Explanation:-
Answer: Option D. -> All of these
Question 8.  Transmission of bubonic plague is by
  1.    rat flea
  2.    inhalation
  3.    ingestion
  4.    all of these
Explanation:-
Answer: Option A. -> rat flea
Question 9. . The reaction(s) that is/are usually positive in Escherichia coli, is/ are
  1.    Glucose fermentation
  2.    Indole reaction
  3.    Methyl red reaction
  4.    All of these
Explanation:-
Answer: Option D. -> All of these
Question 10. . An enrichment medium for the isolation of Shigella is
  1.    Alkaline peptone water
  2.    Terathionate broth
  3.    Selenite F broth
  4.    none of these
Explanation:-
Answer: Option C. -> Selenite F broth
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