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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.
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