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Microbiology

Microbiology
The bacteria which produce(s) β-galactosidase is/are

all of these
Citrobacter
Enterohacter
Serratia

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Microbiology
The Bacillus cereus causes gasteroenteritis by the production of an exoenterotoxin which is released in food as a result of

cell damage
cell permeation
cell growth
cell autolysis

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Microbiology
Enterobacter can be differentiated from Klebsiella by

ornithine positivity
both (a) and (b)
none of these
motility

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Microbiology
Bacteria are

symbiotic
all of these
saprophytic
hyper parasitic

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Microbiology
Dysentery may be caused by

enterotoxigenic E. coli
verotoxigenic E. coli
enteroinvasive E. coli
enteropathogenic Escherichia coli

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

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

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