| Molecular Characteristic | Domain | ||
|---|---|---|---|
| Bacteria | Archaea | Eukarya | |
| Introns(parts of genes that do not code) | Rare | Sometimes present | Present |
| RNA polymerose | One type | Several types | Several types |
| Histones found with DNA | Not present | Present | Present |
| Lipids in cell membrane | Unbranched | Some branched | Unbranched |