Final answer:
The filamentous phage referred to in the question is bacteriophage M13, which is known for infecting E. coli and is useful in recombinant DNA technology.
Step-by-step explanation:
The filamentous phage in question is M13. Bacteriophage M13 is a single-stranded DNA phage that infects E. coli through the pilus during sexual conjugation. Inside the bacterial cell, the M13 DNA synthesizes a complementary strand, becoming a double-stranded replicative form (RF), which can then be used in recombinant DNA technology.