22. Prodigiosin (red pigment) is produced by members of genus
A.Hafnia
B.Enterobacter
C.Serratia
D.Cirobacter

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23. Which of the following serotypes of Salmonella can cause gastroenteritis?
A.S enteritidis
B.S newport
C.S typhimurium
D.All of these

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24.  Sylvatic plague occurs in
A.mice
B.squirrels
C.chipmunks
D.all of these

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25. Verotoxin 1 of Escherichia coli is similar to
A.cholera toxin
B.shiga toxin
C.heat-stable enterotoxin of E. coli
D.heat-labile enterotoxin of E. coli

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26. Which of the following determine 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

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27.  Enterobacter can be differentiated from Klebsiella by
A.ornithine positivity
B.motility
C.both (a) and (b)
D.none of these

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28. In Yersinia pestis, capsule is best demonstrated in cultures grown at
A.25°C
B.29°C
C.37°C
D.45°C

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