Q. Pleomorphic viruses possess double-stranded DNA.

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Q. What is the shape of helical phages?

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Q. Which of the following are said to have binal symmetry?

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Q. The DNA of phage lambda is circular both in the virion and in the host cell.

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Q. Which of the following is a family of lambda phage viruses?

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Q. Which of the following coliphage has tadpole shape?

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Q. Which of the following are filamentous phage of E.coli?

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Q. Which of the following is the first step in replication by bacterial phages?

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Q. At what temperature incubation is required for the adsorption of phage T4 and DNA injection into E.coli?

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Q. Which of the following is the correct sequence of events in replication by bacterial phage?

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Q. The protein coat of the virus remains outside the host cell.

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Q. The delayed early genes codes for which of the following enzymes?

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Q. Which of the following enzymes transcribe late genes?

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Q. In the growth curve of plaque-forming units, the time from infection until lysis is known as ____________________

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Q. What is the colour of the plaque formed?

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Q. What does a viral DNA becomes after being associated with the bacterial chromosome?

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Q. In which of the following method, the viral particles are transmitted through lysis of cell?

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Q. epressor protein makes the cell resistant to lysis.

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Q. Which of the following is the characteristic of repressor protein?

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Q. cro gene is an example of immunity repressor.

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