Phage $\lambda$ Integrates into the E

question 76

Short Answer

Phage $\lambda$ integrates into the E. coli genome using site-specific recombination between a phage sequence, identified as attP, and a bacterial sequence, identified as attB. The attP and attB sequences are different sizes: The attP site is approximately 240-bp long, while attB is significantly shorter at approximately 25 bp. Why does it make sense that the attB site is smaller than the attP site?

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