| Term | Definition |
| Prokaryotes | Bacteria (Includeing Rickettsia) That act like viruses |
| Eukaryotic cells | Protozoa, Fungi- Have a neucleous, mitotic division, organelles present, nuclear membrane present, multiple chromosomes |
| Gram Stain colors | Gram positive (purple) Gram negative (pink) |
| Shapes of bacteria | Spherical, Rod-shaped, very short rods, sprial, curved or comma-shaped |
| Cocci | spherical shape |
| Bacilli | rod-shaped or elongated |
| coccobacilli | very short rods |
| spriochaetes | sprial or coiled |
| vibrios | curved or comma-shaped |
| Rickettsia | obligate intracellular gram-negative rods. Although classified as bacteria, they behave more like viruses |
| What diseases do rickettsia produce? | endemic and epidemic typhus, Rocky mountain spotted fever. |