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CELL CULTURES AND CHARACTERISTICS

Cell Cultures and Characteristics
Which of the following bacteria can grow in acidic pH?

Lactobacilli
Salmonella
Shigella
Vibrio cholerae

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Cell Cultures and Characteristics
Cell size and cell number can be measured using

hemocytometer
none of these
petroff-hausser counting chamber
coulter counter

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

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

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Cell Cultures and Characteristics
In the process of freeze drying, a dense cell suspension is placed in small vials and is frozen at

-60 to -78°C
-20 to -30°C
-48 to -58°C
-30 to -48°C

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Cell Cultures and Characteristics
The solidifying agent commonly used in preparation of media is/are

both (a) and (b)
none of these
agar
silica gel

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