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Microbiology

Microbiology
Which of the following toxin causing botulism is less toxic to human beings?

Type A
None of these
Type C
Type B

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Microbiology
Which of the following determine the pathogenicity of Yersinia pestis?

All of these
Production of pigmented colonies on haemin containing media
V and W antigens
F1 envelope antigen

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Microbiology
Slippery pickles occur due to

addition of high amount of salt
growth of encapsulated bacteria
broken scums of film yeasts on the surface of brine
both (a) and (b)

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Microbiology
The favouring conditions for floaters is

thick skin that does not allow gas to diffuse out
none of these
both (a) and (b)
high intial amounts of salt

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Microbiology
An excessively high temperature in the fermentation of sauerkraut may inhibit the growth of

none of these
both (a) and (b)
Pediococcus cerevisiae
Leuconostoc

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Microbiology
Heat-labile enterotoxin of Escherichia coli activates

adenylate cyclase
none of these
both (a) and (b)
guanylate cyclase

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