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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
70°C for 10 minutes
60°C for 10 minutes

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Cell Cultures and Characteristics
Selective media facilitate growth of only one kind of organism. Saboraud medium is used to selectively isolate

acid fast organisms
gram positive bacteria
yeasts
coliform bacteria

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

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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
enriched medium
selective medium
differential medium

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

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

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

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

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