Prokaryotes

Organisms can be split into two categories, the eukaryotes and the prokaryotes. Prokaryotes are organisms which do not have a cell nucleus or any other membrane bound organelles, such as mitochondria. These differ from eukaryotes which have a nucleus containing genetic information (DNA). Most prokaarotes are uniicellular but there are some that have life cycles with multi cellular stages. Bacteria (such as Escherichia coli) and archaea are prokaryotes. Prokaryotes breed through asexual reproduction, usually either by budding or binary fission.