Unlike most of its kind it can be either lysogenic or lytic, and integrates into the host genome at a cis-acting DNA sequence
It employs headful packaging of its genome during replicating, directed by a site known as cos [koss], so named because it contains cohesive ends that allow it to connect its 48 kilobase linear chromosome in a circle.  Unlike most of its kind it can be either lysogenic or lytic, and integrates into the host genome at a cis-acting DNA sequence att-P.  FTP, name this widely studied bacteriophage of E. coli that shares its name with a Greek letter.
It employs headful packaging of its genome during replicating, directed by a site known as cos [koss], so named because it contains cohesive ends that allow it to connect its 48 kilobase linear chromosome in a circle.  
Lambda phage