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Download Section 1.3: Different cells perform various functions
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Section 1.3: Different cells perform various functions A. Organisms can be classified by their cell type prokaryotes – - unicellular organisms with prokaryotic cells eukaryotes – - organisms with eukaryotic cells A. Organisms can be classified by their cell type Most organisms can be put into one of three domains: - broad categories of organisms based on their cell type 1) Archaea – - prokaryotes that mostly live in extreme environments Hot Springs Archaea were first discovered in extremely hostile environments, such as this hot spring in Yellowstone National Park A. Organisms can be classified by their cell type Most organisms can be put into one of three domains: - broad categories based on their cell type 2) Bacteria – - prokaryotes that share some similarities with archea, but grow virtually everywhere on Earth A. Organisms can be classified by their cell type Most organisms can be put into one of three domains: - broad categories based on their cell type 3) Eukarya – - eukaryotes, which include multicellular organisms (plants, animals, fungi and some protists) and unicellular organisms (some protists) B. Cells in multicellular organisms specialize 1) All multicellular organisms begin life as a single fertilized egg. 2) As cells divide, they specialize. Specialization is when specific cells develop to perform specific functions. 3) The more specialization there is, the more complex the organism. C. A multicellular organism is a community of cells Organisms have different degrees of organization 1) cell - form the base of the organization. They are the “members” of the “community”. 2) tissue - a group of the same cells organized to do a specific job 3) organ - different tissues working together to perform a particular function 4) organ system - different organs and tissues working together 5) organism - the highest level of organization, an individual living thing capable of growing and reproducing The tarsier has many levels of organization in its body.
