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Growth and Nutrition of Bacteria

Growth and Nutrition of Bacteria
Generation time of Escherichia coli is

20 minutes
20 days
20 hours
200 hours

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

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

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Growth and Nutrition of Bacteria
Which of the following procedures uses a photocell to measure absorbance of a culture to regulate the flow of culture media?

Coulter Counter
Petroff-Hausser chamber
Hemostat
Trubidostat

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Growth and Nutrition of Bacteria
During exponential growth, the growth rate is

none of these
reciprocal of generation time
both (a) and (b)
number of generations per unit time

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

chemotrophs
lithotrophs
phototrophs
organotrophs

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Growth and Nutrition of Bacteria
The ability of Vibrio fischeri to produce bioluminescence chemicals only when a certain population density has been reached is an example of

Shelford's law of tolerance
Liebig's law of the minimum
Heisenberg's principle of uncertainty
quorum sensing

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