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Copyright Pearson Prentice Hall  Domains Photo credit: ©Gary Randall/Visuals Unlimited Copyright Pearson Prentice Hall

The Three-Domain System Modern classification is a rapidly changing science! Molecular analyses have given rise to a new taxonomic category that is now recognized by many scientists. The domain is a more inclusive category than any other—larger than a kingdom. Copyright Pearson Prentice Hall

The Three-Domain System The three domains are: Archaea, = kingdom Archaebacteria. Bacteria, = kingdom Eubacteria. Eukarya, = protists, fungi, plants, and animals. Copyright Pearson Prentice Hall

Copyright Pearson Prentice Hall Domain Archaea The domain Archaea corresponds to the kingdom Archaebacteria. Unicellular prokaryotes live in extreme environments (most like early earth) cell walls are simpler, and their cell membranes contain unusual lipids not found in any other organism. Copyright Pearson Prentice Hall

Copyright Pearson Prentice Hall Domain Bacteria The domain Bacteria corresponds to the kingdom Eubacteria. unicellular prokaryotes. cells have thick, rigid cell walls that surround a cell membrane. First organisms to photosynthesize Cyanobacteria Copyright Pearson Prentice Hall

The Tree of Life Evolves Linnaeus (more on him later) classified organisms into two kingdoms— animals and plants. The only known differences among living things were the fundamental traits that separated animals from plants. We now use many different kinds of evidence including DNA, proteins, embryology, etc. Copyright Pearson Prentice Hall

The Tree of Life Evolves The six-kingdom system of classification includes: Eubacteria Archaebacteria Protista Fungi Plantae Animalia Copyright Pearson Prentice Hall

The Tree of Life Evolves Changing Number of Kingdoms Introduced Names of Kingdoms 1700’s Plantae Animalia Late 1800’s Protista Plantae Animalia 1950’s Monera Protista Fungi Plantae Animalia This diagram shows some of the ways organisms have been classified into kingdoms over the years. The six-kingdom system includes the following kingdoms: Eubacteria, Archaebacteria, Protista, Fungi, Plantae, and Animalia. Archae-bacteria 1990’s Eubacteria Protista Fungi Plantae Animalia Copyright Pearson Prentice Hall

Copyright Pearson Prentice Hall Domain Eukarya Domain Eukarya The domain Eukarya consists of organisms that have a nucleus (eukaryotes) This domain is organized into four kingdoms: Protista Fungi Plantae Animalia **NOTE: There is one group of organisms- the Protists that scientists are having trouble classifying. We will look at examples of these in class. Copyright Pearson Prentice Hall

Please Copy and Complete: As we go through this unit, you will find it helpful to summarize your learning in chart form so all of your information is on one page. (you may use the internet to help find more characteristics, if needed) Domains Bacteria Archaea Eukarya Characteristics