When Bacteriophage L Integrates into the Bacterial Chromosome,it Does So

Question

When bacteriophage l integrates into the bacterial chromosome,it does so at:
A) An att P site in the host chromosome.
B) An att B site in the phage chromosome.
C) An att B site in the host chromosome using a lambda-encoded integrase
D) An att B site in the host chromosome using a bacteria-encoded integrase.
E) An att B site in both the host and phage chromosomes

Accepted Answer

When bacteriophage lambda integrates into the bacterial chromosome, it does so at an att site in the host chromosome using a lambda-encoded integrase. Specifically, it integrates at the attL site in the phage chromosome and the attB site in the host chromosome to form an attL-attB complex, which is resolved by the lambda integrase to form a stable prophage. Therefore, choice C is the correct answer.