Here's a breakdown:
* Proteins: These are the building blocks of the capsid. They are arranged in specific, repeating patterns to form a protective shell around the virus's genetic material (DNA or RNA).
* Capsid: This protein shell encloses and protects the virus's genetic material. It also helps the virus attach to and enter host cells.
Some viruses, like the influenza virus, have an additional outer layer called the envelope. This envelope is made of a lipid bilayer (a type of fatty membrane) stolen from the host cell. It's studded with proteins that help the virus bind to and infect new cells.
So, while the primary component of a virus's coating is protein, some viruses have additional layers made of lipids.
