26. Which of the following determines the pathogenicity of Yersinia pestis?

A. V and W antigens
B. F1 envelope antigen
C. Production of pigmented colonies on haemin containing media
D. All of these


Correct Answer: D. All of these

27. Enterobacter can be differentiated from Klebsiella by

A. ornithine positivity
B. motility
C. both (a) and (b)
D. none of these


Correct Answer: C. both (a) and (b)

28. In Yersinia pestis, the capsule is best demonstrated in cultures grown at

A. 25°C
B. 29°C
C. 37°C
D. 45°C


Correct Answer: C. 37°C

29. Which of the following can readily kill Salmonellae?

A. Moist heat at 55°C for 20 min
B. Moist heat at 55°C for 10 min
C. Moist heat at 55°C for 30 min
D. Moist heat at 55°C for 1 hr


Correct Answer: D. Moist heat at 55°C for 1 hr

30. Travelers diarrhea is caused by

A. enteropathogenic Escherichia coli (EPEC)
B. enteroinvasive E. coli (EIEC)
C. enterotoxigenic E. coli (ETEC)
D. enterohemorrhagic E. coli (EHEC)


Correct Answer: C. enterotoxigenic E. coli (ETEC)

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