Viruses Are Isolated from Wild-Type E

question 9

Multiple Choice

Viruses are isolated from wild-type E.coli cells that have been infected with wild-type bacteriophage λ.These viruses are used to infect a Gal⁻ strain of E.coli.A few bacterial colonies that can grow on galactose are obtained, while no bacteria that can grow on galactose are obtained from cells that were not infected.What has happened?

• A)A λ gal⁺ phage was generated.
• B)Reversion mutations have occurred.
• C)The bacteria underwent conjugation with a Gal⁺ strain.
• D)The bacteria underwent transformation with a wild-type E.coli strain.

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