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Cell Cultures and Characteristics

Cell Cultures and Characteristics
Which of the following bacteria dies quickly after drying?

Pseudomonas aeruginosa
Mycobacterium tuberculosis
Staphylococcus aureus
Treponema pallidium

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Cell Cultures and Characteristics
Plate counts are often reported as

thousands/ml
cfu
cfu/ml
Both (a) and (b)

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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
A disease producing species occurring in a mixed culture can often be selected on the basis of its

pathogenic properties
special carbon source
special nitrogen source
none of these

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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

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

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

chemolithotrophs
heterotrophs
phototroph
autotrophs

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