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Growth and Nutrition of Bacteria

Growth and Nutrition of Bacteria
Generation time of Escherichia coli is

20 hours
20 minutes
200 hours
20 days

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Growth and Nutrition of Bacteria
Organisms, using organic compounds as electron donors are called

chemotrophs
phototrophs
lithotrophs
organotrophs

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Growth and Nutrition of Bacteria
The combination of low levels of NaCl, NaNO3 (sodium nitrate), and slightly acid pH can prevent multiplication and toxin formation of

Salmonella
C. botulinum
S. aureus
all of these

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Growth and Nutrition of Bacteria
Implicit factors

both (a) and (b)
can be synergistic
depend on developing microflora
None of these

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Growth and Nutrition of Bacteria
The equation used to obtain bacterial population by binary fission is

log(N/No) = nlog 2
All of these
N = No2n
log N/No = (0.3010) n

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Growth and Nutrition of Bacteria
What are the extrinsic factors for the microbial growth?

humidity
all of these
storage temperature
composition of gas phase

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