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Microbiology

Microbiology
Which of the following gram-negative bacteria is/are not aerobic?

None of these
Neisseria
Escherichia
Pseudomonas

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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
73 Gy
173 Rad
7.3 Mrad

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Microbiology
Blackening in pickles occurs due to

both (a) and (b)
None of these
the formation of hydrogen sulfide by bacteria
growth of Pencillium

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Microbiology
The favouring conditions for floaters is

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

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Microbiology
Group I C. botulinum strains generally includes in

all types of strains (proteolytic)C, D and F
None of these
all types of strains (proteolytic)A, B and F
all types of strains (non-proteolytic) E and F

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Microbiology
In Widal test the significant titres for H agglutinins is

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

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