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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

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

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Cell Cultures and Characteristics
A medium containing crystal violet dye plus sodium deoxycholate will allow

gram (-)ve intestinal bacteria to grow
gram (+)ve intestinal bacteria to grow
none of these
aquatic bacteria to grow

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

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

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Cell Cultures and Characteristics
Pseudomonas aeruginosa forms a blue water soluble pigment called

β-carotene
chlororaphin
pyocyanin
pyoverdin

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Cell Cultures and Characteristics
Cell counting can be carried out by

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