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Microbiology

Microbiology
Gram-negative bacteria, responsible for food poisoning, is/are

Salmonella
Clostridia
Pseudomonas
None of these

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

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

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Microbiology
Hollow pickles are obtained as a result of

loose packing in the vat
both (a) and (b)
none of these
too strong or too weak brine

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Microbiology
Which of the following can readily kill Salmonellae?

Moist heat at 55°C for 20 min
Moist heat at 55°C for 1 hr
Moist heat at 55°C for 30 min
Moist heat at 55°C for 10 min

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Microbiology
Slippery pickles occur due to

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

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Microbiology
Primarily human pathogenic bacteria is/are ,

S paratyphi B
all of these
Salmonella typhi
S paratyphi A

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