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Microbiology

Microbiology
Coliform bacteria on fermentation of carbohydrates yields

acetic acid
all of these
formic acid
lactic acid

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Microbiology
Bipolar staining is characteristic of

all of these
Proteus mirabilis
Yersinia pestis
Pseudomonas aeruginosa

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

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

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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

diacetyl
butyric acid
acetyl coA
acetone

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

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

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Microbiology
Primarily human pathogenic bacteria is/are ,

Salmonella typhi
S paratyphi A
all of these
S paratyphi B

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