Q. cro gene is an example of immunity repressor.

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Q. Which of the following gene codes for an enzyme which directs the insertion of the phage DNA into the bacterial chromosome?

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Q. Which of the following phage do not cause lysogeny?

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Q. The protein integrase is encoded by which of the following gene?

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Q. In which of the following phage prophage exists as a circular form?

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Q. From which of the following animal was the material isolated which was used for the vaccination for the first time?

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Q. Vaccination was invented by ____________

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Q. Causative agent of tobacco mosaic disease was filterable.

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Q. Yellow fever virus can be attenuated by serial passage on cultures of ________________________

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Q. Effective poliomyelitis vaccines were developed by culturing the virus of poliomyelitis on the kidney cells of which animal?

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Q. For which viral disease, vaccine has been recently developed through the use of tissue culture?

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Q. Rubella vaccines contain viruses are isolated only in African green monkey cells.

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Q. Translation of mRNA into proteins takes place in the ________________

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Q. Which of the following symmetry is exhibited by rod-shaped viruses?

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Q. The envelope surrounding the nucleocapsid of some animal viruses is made up of which of the following structures?

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Q. Adenoviruses exhibit which of the following symmetry?

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Q. The fringes on animal viruses like influenza virus is made up of ______________

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Q. Animal and plant viruses contain both DNA and RNA in the same virion.

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Q. Parvoviruses contain how many genes?

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Q. In papovaviruses, DNA occurs in which of the following forms?

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