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Cell Cultures and Characteristics

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

Lactobacilli
Shigella
Vibrio cholerae
Salmonella

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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

8.90
8.5
6.79
3.5

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

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

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Cell Cultures and Characteristics
The concentration of agar to obtain semi solid media is

>10%but<20%
>10%
0.5% or less
1.5-20%

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

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

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Cell Cultures and Characteristics
Which of the following techniques may be performed quantitatively to determine the number of bacteria of a particular type?

Both (a) and (b)
Streak plate technique
Spread plate
Pour plate

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