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Cell Cultures and Characteristics

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
Treponema species from human oral cavity can be selected by using

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

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Cell Cultures and Characteristics
Peptone water and nutrient broth are

none of these
enriched media
basal media
selective media

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Cell Cultures and Characteristics
Intestinal bacteria can grow in the presence of __________ whereas nonintestinal bacteria are usually inhibited.

bile salts
low concentration of various dyes
sugars
low levels of nitrogen

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Cell Cultures and Characteristics
In the pour plate method, the mixed culture is diluted directly in tubes of

none of these
sterile liquid usually water
liquid agar medium
both (a) and (b)

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

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

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