Some viruses have a lipid bilayer,also known as the viral envelope. The viral envelope most likely comes from the following source:

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The viral envelope is derived from the host cell plasma membrane. As the virus exits the host cell, it takes some of the host cell membrane with it. This membrane surrounds the viral capsid, or protein coat, forming the lipid bilayer that makes up the viral envelope.

Some Viruses Have a Lipid Bilayer,also Known as the Viral