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NEST2021BiologyBiological Classification

Escherichia coli grown in liquid nutrient medium is infected with a virus at a concentration that will result in the entry of a single virus per bacterium. This eventually results in lysis (death) of the Escherichia coli cell releasing the viral progeny that can in turn infect neighboring cells. Such a culture is incubated at 37^ C , and the cell-free supernatant is sampled every few minutes in order to enumerate the

Options

  1. AThe initial lag period is the time taken by the viruses to attach and enter the bacterial cells.
  2. BAn antibiotic effective against Escherichia coli when added at 0.2 hour will not result in any viral progeny.
  3. CWhen Escherichia coli is infected with an attenuated virus, a similar sigmoidal curve should be observed.
  4. DThe slope of this sigmoidal curve is not indicative of rate of viral multiplication.

Correct answer

B. An antibiotic effective against Escherichia coli when added at 0.2 hour will not result in any viral progeny.

Step-by-step solution

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