Presentation on theme: "Different cells perform various functions."— Presentation transcript:
1 Different cells perform various functions. Notes E 1.3Different cells perform various functions.
2 Organisms can be classified by their cell types. Most organisms are unicellular3 domains of organisms:Archaea: prokaryotes, live in extreme environmentsBacteria: prokaryotes, share some similarities with Archaea, but live in most environmentsEukarya: Eukaryotes, include multicellular organisms (plants, animals, fungi, and some protists)
3 DomainsDomains, kingdoms, and other classifications remain in flux and debated within the scientific community.Some scientists recognize 5 kindoms instead of 6. Some refer to domains rather than ingdoms.
4 Cells in multicellular organisms specialize. All mc organisms begin as a single fertilized egg cell.As cells divide, they specialize to perform specific jobs.The more specialization there is, the more complex the organism is.
5 A multicellular organism is a community of cells. Organisms have different levels of organization :Similar cells group together to form tissues.Tissues act together to form organs.Organs and tissues act together to form organ systems.
6 Scientists use models to study cells. Scientists use models to make complicated structures or processes easier to understand.Some examples of models:Mathematical or chemical equationsDiagramsProcess modelsPhysical models