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Microbiology

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

Enterohacter
Serratia
Citrobacter
all of these

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

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

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Microbiology
Thermus thermopiles is a

gram negative archebacteria
gram negative eubacteria
gram positive archebacteria
gram positive eubacteria

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Microbiology
Yersinia enterocolitica and Y. pestis can be differentiated on the basis of which of the following tests?

Motility at 22°C
Decarboxylation of ornithine
All of these
Fermentation of sucrose and cellobiose

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

Salmonella
Shigella
Yersinia
All of these

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Microbiology
The favouring conditions for floaters is

none of these
high intial amounts of salt
both (a) and (b)
thick skin that does not allow gas to diffuse out

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