| A | B |
|---|
| virus | small, nonliving particle; invades and reproduces using a host |
| host | living organism that provides a source of energy for a virus or other organism |
| parasite | organism that lives in or on another organism and causes it harm |
| bacteriophage | a virus that infects bacteria |
| vaccine | a substance made from dead or altered viruses or bacteria |
| two parts of a virus | the outer protein coat and the inner core that is made of genetic material |
| active virus | make the host cell create new viruses, which kill the host cell |
| latent virus | hide in the host cell without destroying it |
| gene therapy | research that uses viruses to replace defective cell heredity material with normal cell heredity material |
