Viruses attach to living cells by binding to the cell receptors. The receptor site is very much like a jig-saw puzzle and the virus must be shaped to fit the site and to lock in. The virus first...
by clinging to receptors
with its tail
virus have only one living character i.e dividing itself and that they do by the help of host nuclear machinary as they lack their own
Computer viruses can be attached to e-mail messages, address books, and attachments.