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Microbiology

Microbiology
Bacteria are

all of these
hyper parasitic
saprophytic
symbiotic

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

Glucose fermentation
All of these
Indole reaction
Methyl red reaction

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Microbiology
The application of Gamma rays destroys botulism toxin. The dose of gamma rays required for this purpose is

73 Rad
173 Rad
73 Gy
7.3 Mrad

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Microbiology
In Widal test the significant titres for H agglutinins is

1:100 ormore
1:400 or more
1:50 or more
1:200 or more

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Microbiology
Shriveling in fermented pickles results from the physical effect of

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

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Microbiology
Primarily human pathogenic bacteria is/are ,

S paratyphi A
all of these
S paratyphi B
Salmonella typhi

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