virus structure
All viruses have two basic parts: a protein coat that protects the virus and an inner core made of genetic material. A viruses genetic material contains the instructions for making new viruses. Some viruses are also surrounded by an additional outer membrane, or envelope.
The proteins on the surface of a virus play an important role in attacking the host cell. Each virus contains unique surface proteins. The shape of the surface proteins allows the virus to attach to certain cells. Like keys, the a virus's proteins fit only into certain "locks," or proteins, on the surface of the host's cell. Because of the lock-key-action, a certain virus can only attach to one or a few types of cells cells.
The proteins on the surface of a virus play an important role in attacking the host cell. Each virus contains unique surface proteins. The shape of the surface proteins allows the virus to attach to certain cells. Like keys, the a virus's proteins fit only into certain "locks," or proteins, on the surface of the host's cell. Because of the lock-key-action, a certain virus can only attach to one or a few types of cells cells.