Biology 18.3
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Transcript of Biology 18.3
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Kingdoms and Domains 18.3
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Domain
• Most inclusive taxonomic category; larger than a kingdom.
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Bacteria
• Domain of unicellular prokaryotes that have cell walls containing peptidoglycan.
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Eubacteria
• Kingdom of unicellular prokaryotes whose cell walls are made up of peptidoglycan.
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Archaea
• Domain of unicellular prokaryotes that have cell walls that do not contain peptidoglycan.
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Archaebacteria
• Kingdom of unicellular prokaryotes whose cell walls that do not contain peptidoglycan.
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Eukarya• Domain of all organisms whose cells have
nuclei, including protists, plants, fungi, and animals.
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Protista
• Kingdom composed of eukaryotes that are not classified as plants, animals, or fungi.
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Fungi
• Kingdom composed of heterotrophs; many obtain energy and nutrients from dead organic matter.
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Plantae• Kingdom of multicellular photosynthetic
autotrophs that have cell walls containing cellulose.
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Animalia
• Kingdom of multicellular eukaryotic heterotrophs whose cells do not have cell walls.
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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.
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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.