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Cell Cultures and Characteristics

Cell Cultures and Characteristics
For the selection of endospore-forming bacteria, a mixed culture can be heated at

80°C for 10 minutes
90°C for 10 minutes
60°C for 10 minutes
70°C for 10 minutes

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Cell Cultures and Characteristics
Important example(s) of enriched medium/media is/ are

All of these
Bordet-gengou medium
Blood agar
Loeffler's serum slope

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Cell Cultures and Characteristics
Treponema species from human oral cavity can be selected by using

cell size and motility
pH of the medium
incubation temperature
all of these

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Cell Cultures and Characteristics
Which of the following is used for the proper maintenance and preservation of pure cultures?

Periodic transfer to fresh media
Preservation by lyophilization
Preservation by overlaying cultures with mineral oil
All of these

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Cell Cultures and Characteristics
Plate counts are often reported as

cfu/ml
cfu
Both (a) and (b)
thousands/ml

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Cell Cultures and Characteristics
To select cholera-causing bacterium, Vibrio cholerae, the pH of the medium is maintained at a pH of

6.79
3.5
8.90
8.5

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