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Cell Cultures and Characteristics

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

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

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

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

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Cell Cultures and Characteristics
When a substance is added to a solid medium which inhibits the growth of unwanted bacteria but permits the growth of wanted bacteria, it is known as

enrichment medium
differential medium
enriched medium
selective medium

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Cell Cultures and Characteristics
Cell counting can be carried out by

plate counting
All of these
direct microscopic count using petroffhansser counting chamber
membrane filter count

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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

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

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

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

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