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Kingdoms and Domains 18.3 Domain • Most inclusive taxonomic category; larger than a kingdom. Bacteria • Domain of unicellular prokaryotes that have cell walls containing peptidoglycan. Eubacteria • Kingdom of unicellular prokaryotes whose cell walls are made up of peptidoglycan. Archaea • Domain of unicellular prokaryotes that have cell walls that do not contain peptidoglycan. Archaebacteria • Kingdom of unicellular prokaryotes whose cell walls that do not contain peptidoglycan. Eukarya • Domain of all organisms whose cells have nuclei, including protists, plants, fungi, and animals. Protista • Kingdom composed of eukaryotes that are not classified as plants, animals, or fungi. Fungi • Kingdom composed of heterotrophs; many obtain energy and nutrients from dead organic matter. Plantae • Kingdom of multicellular photosynthetic autotrophs that have cell walls containing cellulose. Animalia • Kingdom of multicellular eukaryotic heterotrophs whose cells do not have cell walls. Key Concept • What are the six kingdoms of life as they are now identified? –The six-kingdom system of classification includes the kingdoms Eubacteria, Archaebacteria, Protista, Fungi, Plantae, and Animalia. Key Concept • What is the three-domain system of classification? –The three domains are the domain Eukarya, Which is composed of protists, fungi, plants, and animals; the domain Bacteria, which corresponds to the kingdom Eubacteria; and the domain Archaea, which corresponds to the kingdom Archaebacteria.