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Transcript
Biology11
17.3DomainsandKingdoms
GroupingSpecies
§ Thebroadestcategoryintheclassificationusedbymostbiologistsisthedomain.
§ Themostwidelyusedbiologicalclassificationsystemhassixkingdomsandthree
domains.
§ ThethreedomainsareBacteria,Archaea,andEukarya.
§ ThesixkingdomsareBacteria,Archaea,Protists,Fungi,Plantae,andAnimalia.
DomainBacteria
§ Eubacteriaareprokaryoteswhosecellwallscontainpeptidoglycan.
§ Eubacteriaareadiversegroupthatcansurviveinmanydifferentenvironments.
DomainArchaea
§ Archaeaarethoughttobemoreancientthanbacteriaandyetmorecloselyrelatedto
oureukaryoteancestors.
§ Archaeaarediverseinshapeandnutritionrequirements.
§ Theyarecalledextremophilesbecausetheycanliveinextremeenvironments.
DomainEukarya
§ AlleukaryotesareclassifiedinDomainEukarya.
§ DomainEukaryacontainsKingdomProtista,KingdomFungi,KingdomPlantae,and
KingdomAnimalia.
KingdomProtista
§ Protistsareeukaryoticorganismsthatcanbeunicellular,colonial,ormulticellular.
§ Protistsareclassifiedintothreedifferentgroups—plantlike,animal-like,andfunguslike.
KingdomFungi
§ Afungusisaunicellularormulticellulareukaryotethatabsorbsnutrientsfromorganic
materialsinitsenvironment.
§ MemberofKingdomFungiareheterotrophic,lackmotility,andhavecellwalls.
KingdomPlantae
§ MembersofKingdomPlantaeformthebaseofallterrestrialhabitats.
§ Allplantsaremulticellularandhavecellwallscomposedofcellulose.
§ Mostplantsareautotrophs,butsomeareheterotrophic.
KingdomAnimalia
§ Allanimalsareheterotrophic,multicellulareukaryotes.
§ Animalorgansoftenareorganizedintocomplexorgansystems.
§ Theyliveinthewater,onland,andintheair.
Biology11
Viruses—AnException
§ Avirusisanucleicacidsurroundedbyaproteincoat.
§ Virusesdonotpossesscells,noraretheycells,andarenotconsideredtobeliving.
§ Becausetheyarenonliving,theyusuallyarenotplacedinthebiologicalclassification
system.