2009-2010AP Biology Cells & Cell OrganellesDoing Life?s Work Regents Biology bacteriacellsTypes of cells animal cells plant cells Prokaryote- no organelles Eukaryotes- organelles Regents Biology Cell size comparison Bacterial cellAnimal cell ? micron = micrometer = 1/1,000,000 meter? diameter of human hair = ~20 microns most bacteria? 1-10 micronseukaryotic cells ? 10-100 microns Regents Biology Why study cells?? Cells ? Tissues ? Organs ? Bodies? bodies are made up of cells? cells do all the work of life! Regents Biology