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Microbiology

Microbiology
Coliform bacteria on fermentation of carbohydrates yields

formic acid
all of these
acetic acid
lactic acid

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Microbiology
Which of the following determine the pathogenicity of Yersinia pestis?

Production of pigmented colonies on haemin containing media
F1 envelope antigen
All of these
V and W antigens

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Microbiology
Heat-stable enterotoxin of Escherichia coli activates

adenylate cyclase
both of the above
none of these
guanylate cyclase

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Microbiology
Which of the following property(ies) is/are seen in the members of family Enterobacteriaceae?

They are oxidase-negative
They reduce nitrates to nitrites
They ferment glucose
They are catalase-positive

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Microbiology
Floaters or bloaters may result from

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

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Microbiology
Gram-negative bacterium is/are

Clostridia
All of these
Staphylococci
Escherichia

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