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Microbiology

Microbiology
Soft pickles are made so by pectolytic enzymes mostly from

bacteria
moulds
none of these
yeasts

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Microbiology
Which of the following(s) bacteria belong to the family Entero-bacteriaceae?

All of these
Yersinia
Salmonella
Shigella

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Microbiology
Too long a fermentation of sauerkraut may favour the growth of

Bacillus subtilis
Lactobacillus brevis
none of these
Lactobacillus lactis

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Microbiology
The milk streptococci produce acetoin that gets spontaneously oxidized yielding a flavorings agent (responsible for aroma of butter) that is

acetyl coA
diacetyl
butyric acid
acetone

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Microbiology
Floaters or bloaters may result from

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

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Microbiology
Which of the following serotypes of Salmonella does not produce H2S?

S choleraesuis
None of these
S paratyphi A
Both (a) and (b)

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