Thayne Sweeten
| -Do not have their genetic material enclosed inside a membrane; it is typically one circular chromosome. -Do not have membrane bound organelles. -Do not have DNA associated with histone proteins (special chromosomal proteins found in eukaryotes). -Usually have cell walls containing peptidoglycan -Divide by binary fission | ![]() | |
| 0.2 to 2.0 micrometers in diameter and 2 to 8 micrometers in length | ||
| Round or spherical | ![]() | |
| Rod shaped | ![]() | |
| bacilli which look like cocci | ||
| comma shaped, spiral shaped, or corkscrew shaped | ![]() | |
| varies in shape | ![]() | |
| Star shaped and square shaped bacteria have recently been discovered. | ||
| -Single -Diplococci (pairs) -Streptococci (chains) -Tetrads (packet of four) and sarcinae (packets of eight) -Staphylococci (irregular clusters) | ![]() | |
| -Single -Diplobacilli (pairs) | ![]() | |
| Coccobacilli (resemble cocci) | ![]() |






