Bacteria Bacteria are called Prokaryotes which means before the nucleus. Live in very hash environments. Their ribosomes are different from those in Eubacteria. Their lipid membrane is very different. Their DNA and RNA sequences are very different from Eubacteria.
Cell wall is different.
Live in extremely salty places. Live in very hot environments. Some bacteria have extra small pieces of circular DNA called plasmids. Smile layers serve to attach bacteria to surfaces. Some have flagella for movement.