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Cell Cultures and Characteristics

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

chlororaphin
pyocyanin
β-carotene
pyoverdin

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Cell Cultures and Characteristics
Cell counting can be carried out by

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

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Cell Cultures and Characteristics
All bacteria that inhabit the human body are

autotrophs
phototroph
chemolithotrophs
heterotrophs

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

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

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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
90°C for 10 minutes
70°C for 10 minutes

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Cell Cultures and Characteristics
Which of the following is used for the proper maintenance and preservation of pure cultures?

All of these
Preservation by overlaying cultures with mineral oil
Preservation by lyophilization
Periodic transfer to fresh media

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