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 2. Thee three domains in the tree of life are bacteria, archaea, and eukarya

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PostSubject: 2. Thee three domains in the tree of life are bacteria, archaea, and eukarya   04/02/09, 11:04 pm

• Prokaryotes are in Bacteria and Archaea, eukaryotes are in eukarya

BACTERIA
• Bacteria- includes single-celled prokaryotes in the kingdom bacteria
• One of the largest groups of organisms on earth
• Classified by many things, like need for oxygen, and whether they cause disease

ARCHAEA
• Archaea- are single-celled prokaryotes in the kingdom archaea
• Cell walls of Archaea and Bacteria is chemically different
• Can live in extreme environments, like deep sea vents, hot geysers, Antarctic waters, and salt lakes

EUKARYA
• Eukarya- made up of all organisms with eukaryotic cells
• Can be single-celled, or multicellular
• Includes kingdoms Protista, Plantae, Fungi, and Animalia

CLASSIFYING BACTERIA AND ARCHAEA
• Some scientists think that bacteria and Achaea have no true species
• Sharing of genes blur the lines between species
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