Spirochacter and Enterobacteriaceac – Section 1


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1. Which of the following serotypes of Salmonella does not produce H2S?

A. S choleraesuis
B. S paratyphi A
C. Both (a) and (b)
D. None of these

Correct Answer: C. Both (a) and (b)
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2. Which of the following is the commonest species of Salmonella for causing zoonotic disease?

A. S Indiana
B. S Newport
C. S Typhimurium
D. S enteritidis

Correct Answer: C. S Typhimurium
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3. Which of the following media is selective for Salmonella?

A. Thiosulphate citrate bile salt agar
B. Wilson and Blair’s brilliant-green bismuth sulfite agar medium
C. Bile salt agar
D. All of the above

Correct Answer: B. Wilson and Blair’s brilliant-green bismuth sulfite agar medium
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4. Xylose lysine deoxycholate (XLD) agar is better selective medium than the deoxycholate citrate agar (DCA) because

A. it is selective
B. it imparts better growth
C. it contains a high salt concentration
D. it is less inhibitory to S. Dysentriae and S. flexneri

Correct Answer: D. it is less inhibitory to S. Dysentriae and S. flexneri
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5. Which of the following property(ies) is/are seen in the members of family Enterobacteriaceae?

A. They are catalase-positive
B. They are oxidase-negative
C. They ferment glucose
D. They reduce nitrates to nitrites

Correct Answer: B. They are oxidase-negative
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