Three Domains Of Life: Bacteria And Eukarya

3. There are three domains of life: Bacteria (also known as Eubacteria), Archaea, and Eukarya. The Bacteria and Archaea are made up entirely of microorganisms; the Eukarya contains plants, animals, and microorganisms such as fungi and protists. The Bacteria and Archaea have been grouped together and called Prokaryotes because of their lack of a nucleus, but the Archaea are more closely related to the Eukaryotes than to the Bacteria. The cell wall of bacteria contains peptidoglycan, while, Eukarya and Archaea do not contain peptidoglycan. In Eukarya and bacteria, they have membranes composed of unbranched fatty acid chains attached to glycerol by ester linkages, but in Archaea, unlike the Bacteria and the Eukarya, they have membranes composed