Q. Which of the following cells of E.coli are referred to as F—?

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Q. What is the frequency of formation of recombinants in a F+ X F— cross?

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Q. The F factor DNA is sufficient to specify how many genes?

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Q. Which of the following is true for an Hfr X F— cross?

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Q. Which of the following can be used as a measure to construct a linkage map of the Hfr chromosome?

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Q. The Hfr chromosome is transferred to the F— cell in a _____________ fashion.

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Q. How much time is required to inject a copy of the whole Hfr E.coli genome?

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Q. How much time is taken by the new DNA to make whole phage particles?

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Q. When viral genome can become integrated into the bacterial genome they are known as ____________

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Q. Bacteriophages inject their nucleic acid into the bacterium.

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Q. Which of the following role is performed by a bacteriophage in transduction?

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Q. The viral DNA may be incorporated into the phage head during phage assembly.

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Q. What is the frequency of defective phage particles in progeny phage produced?

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Q. Fragments transferred by a bacteriophage contains how many genes?

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Q. What is the correct order when coliphage P1 is grown in a thr+ leu+ aziR host is used to infect a thr- leu- azi- recipient bacterial cell?

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Q. How many percent of thr+ transducing phages also carry leu+?

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Q. When the phage transduces only those bacterial genes adjacent to the prophage in the bacterial chromosome then it is known as?

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Q. What are the characteristics of rough pneumococci strain?

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Q. In Griffith’s experiment which of the following strains of pneumococci was isolated from dead mice?

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Q. Which of the following things was identified as the transforming principle?

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