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Growth and Nutrition of Bacteria

Growth and Nutrition of Bacteria
Generation time of Escherichia coli is

20 days
20 minutes
20 hours
200 hours

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Growth and Nutrition of Bacteria
The average size of cells during the exponential phase of growth is

equal to the lag phase
none of these
lesser than the lag phase
greater than the lag phase

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Growth and Nutrition of Bacteria
Bacteria and fungi multiply best

above 38°C
between 16-38°C
below 16°C
none of these

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

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Growth and Nutrition of Bacteria
The fragmentation occurs in

Nocardia species
None of these
Bacillus subtilis
Streptomyces species

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Growth and Nutrition of Bacteria
Organisms such as lactobacilli that have elaborate requirements for specific nutrients i.e. vitamins and other growth promoting substances, are generally called as

chemotrophs
fastidious hetrotrophs
photo-organotrophs
chemo-lithotrophs

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