Bacteriophages
The filamentous bacteriopohage infect male E. coli cells by attaching to

lipopolysaccharide
the cell membrane
the tip of the pilus
the cell wall

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Bacteriophages
In viruses with envelopes

the envelope is coded by the viral nucleic acids, but the proteins come from the host's membrane proteins
the envelope and its imbedded proteins are derived from the host's membranes
the envelope is derived from the host but it contains embedded proteins coded by the viral nucleic acid
the envelope and the embedded proteins are encoded by the viral nucleic acid

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