The Diversity of Cellular Life Objectives: 5.0. Identify cells, tissues, organs, organ systems, organisms, populations, communities, and ecosystems as levels of organization in the biosphere. 5.1 Recognizing that cells differentiate to perform specific functions Examples: ciliated cells to produce movement, nerve cells to conduct electrical charges

Unicellular vs. Multicellular Organisms One cell vs. many cells NOT the same as prokaryotic vs. eukaryotic Examples of unicellular organisms: Yeast and spirogyra algae filaments (eukaryotic), bacilli bacterial cells (prokaryotic) http://www.yellowtang.org/images/bacterial_cells1_c_ph_784.jpg Source: http://saburchill.com/ans02/chapters/chap050.html

Specialized Cells in Multicellular Organisms http://www.sciencequiz.net/jcscience/jcbiology/circulatorysystem/blood2.jpg http://www.sciencequiz.net/jcscience/jcbiology/circulatorysystem/blood2.jpg Source: http://www.austincc.edu/histologyhelp/tissues/tf_strat_sq_nk_e.html RBC, skeletal muscle, guard cell pair surrounding stomata, stratified squamous epithelial cells Source: http://sols.unlv.edu/Schulte/Anatomy/Leaves/Leaves.html

Levels of Organization in Multicellular Organisms Similar cells join together to form… tissues. Groups of different tissues work together to form….. organs. Groups of organs that work together to perform a specialized task are called….. organ systems. All the organ systems work together to complete an organism.