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Microbiology

Microbiology
Soft pickles are made so by pectolytic enzymes mostly from

none of these
moulds
yeasts
bacteria

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Microbiology
In Widal test, the significant titre for O agglutinins is generally

1:50 or more
1:100 or more
1:2.00 or more
1:150 or more

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Microbiology
Xylose lysine deoxycholate (XLD) agar is better selective medium than the deoxycholate citrate agar (DCA) because

it imparts better growth
it is less inhibitory to S. Dysentriae and S. flexneri
it is selective
it contains high salt concentration

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Microbiology
Slippery pickles occur due to

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

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Microbiology
Salmonellois is caused by the

endotoxin of Salmonella spp
neurotoxin of Salmonella spp
enterotoxin of Salmonella spp
exoenterotoxin of Salmonella spp

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Microbiology
Floaters or bloaters may result from

hollow cucumbers
hetero fermentative lactic acid bacteria
gas being formed by yeasts
all of these

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