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Microbiology

Microbiology
Bacteria are

symbiotic
all of these
hyper parasitic
saprophytic

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Microbiology
Blackening in pickles occurs due to

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

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Microbiology
The growth of black-pigmented Bacillus nigrificans, a causative agent of black pickle is favoured by

neutral or slightly alkaline brine
presence of carbohydrate like glucose
low level of available nitrogen
All of these

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Microbiology
The enzyme, which hydrolyses the murein is

lysozyme
tannase
none of these
perxoidase

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

Methyl red reaction
Indole reaction
All of these
Glucose fermentation

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

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

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