| Term | Definition |
| AIDS | acquired immune deficiency syndrome |
| AIDS Symptoms | Usually rare infections become fatal |
| AZT | First treatment to slow reproduction of AIDS |
| HIV | causative infections agent that attacks the immune cells & continually evolves by mutations in DNA (similar to flu virus) |
| Genetic Engineering | manipulating DNA in cells to improve health, crops… |
| HGH | controls growth-made in lab by inserting DNA sequence into bacteria |
| Control | standard against which the experimental factors are compared and possibly changed |