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Microbiology

Microbiology
Transmission of bubonic plague is by

all of these
ingestion
rat flea
inhalation

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Microbiology
Which of the following can readily kill Salmonellae?

Moist heat at 55°C for 10 min
Moist heat at 55°C for 30 min
Moist heat at 55°C for 20 min
Moist heat at 55°C for 1 hr

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Microbiology
The most important bacterium developing acidity in both low and high salt brines is

L. plantarum
L. brevis
B. subtilis
L. lactis

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Microbiology
Gassy spoilage of green olives is usually caused by

Clostridium spp
all of these
Enterobacter spp
Bacillus spp

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Microbiology
The favouring conditions for floaters is

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

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

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

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