Bacteriophages
T-even phage binding to E. coli probably involves

electrostatic interaction
covalent bonds
hydrophobic interaction
all of these

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Bacteriophages
In viruses with envelopes

the envelope and the embedded proteins are encoded by the viral nucleic acid
the envelope is derived from the host but it contains embedded proteins coded by the viral nucleic acid
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

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