Two Cell Types With the invention of microscopes and cells, scientists saw that there were two broad groups of cells. Picture 1 : Bacteria Picture 2 : Human Blood Smear

Prokaryotes PROKARYOTES Cells lacking membrane bound organelles Most Cell functions occur in the cytoplasm Has free DNA, no nucleus Has Pili and Flagella for cell movement (locomotion) Has a Plasma Membrane and Cell Wall Contain free Ribosomes Example: Bacteria

Eukaryotes EUKARYOTES Cells with membrane bound organelles Each organelle has a certain function / “job” in the cell for cell survival Allows for separation of chemical reactions that could not occur simply in the cytoplasm The nucleus controls cell function (Virchow – Cell Structure, Cell Division) Example: Animal and Plant Cells NOTE: Algae and Yeast are eukaryotes and are unicellular