When a Bacterial Cell Is Infected with a Nonlytic Bacteriophage

question 32

Multiple Choice

When a bacterial cell is infected with a nonlytic bacteriophage with Tn5 on its chromosome,the frequency of Tn5 transposition is dramatically reduced if Tn5 is already maintained on the bacterial chromosome.Why?

• A) Phage integration occurs via Tn5 homology disrupting the transposase.
• B) Tn5 transposition is inhibited by phage gene products.
• C) Tn5 on the bacterial chromosome expresses a repressor of transposition.
• D) Transposase is not expressed from Tn5 elements integrated within the bacterial chromosome.
• E) None of these

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