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Microbiology

Microbiology
Prodigiosin (red pigment) is produced by members of genus

Hafnia
Enterobacter
Serratia
Cirobacter

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Microbiology
Verotoxin 1 of Escherichia coli is similar to

shiga toxin
heat-labile enterotoxin of E. coli
heat-stable enterotoxin of E. coli
cholera toxin

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Microbiology
Shriveling in fermented pickles results from the physical effect of

too strong sugar solution
too strong vinegar solution
all of these
too strong salt solution

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

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

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

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

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Microbiology
The reaction(s) that is/are usually positive in Escherichia coli, is/ are

Indole reaction
Methyl red reaction
All of these
Glucose fermentation

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