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Microbiology

Microbiology
In Widal test the significant titres for H agglutinins is

1:400 or more
1:200 or more
1:100 ormore
1:50 or more

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Microbiology
Heat-stable enterotoxin of Escherichia coli activates

adenylate cyclase
none of these
guanylate cyclase
both of the above

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Microbiology
Cloudiness of brine of glass-packed olives may be caused by

film yeasts or moulds if air is available
salt-tolerant bacteria
All of these
the lactics if fermentation of residual sugar resumes

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Microbiology
A bacterial food intoxication refers to

food borne illness caused by the presence of a bacterial toxin formed in food
None of these
both (a) and (b)
illness caused by presence of pathogens

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Microbiology
The application of Gamma rays destroys botulism toxin. The dose of gamma rays required for this purpose is

173 Rad
7.3 Mrad
73 Rad
73 Gy

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Microbiology
The staphylococcal intoxication refers to presence of

All of these
neurotoxin
mycotoxin
an enterotoxin

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