1. Cells Alive!

2. Cell History 1. The invention of microscope led to the study of cells 2. Notable Scientists a. Robert Hooke: 1 st to describe the cell b. Schleiden: Plants are composed of cells c. Schwann: Animals are composed of cells

3. Cell Theory 1.All organisms are made of one or more cells 2.The cell is the basic unit of structure and function 3.All cells come from preexisting cells (Virchow)

4. Cell Types Two Types: Prokaryotic and Eukaryotic Prokaryotic 1.No true Nucleus: Nuclear material scattered like a scrambled egg 2.Simple cell; very few cell organelles 3.Most are unicellular 4.Ex. e. coli bacteria

5. Cell types Eukaryotic 1.True nucleus: Cell looks egg cooked sunny side up! 2.Complex cell; many cell organelles 3.Single or multicellular 4.Ex. Plant Cell or Animal Cell

6. Animal Cells vs. Plant Cells Centrioles chromosome

7. Animal Cells vs. Plant Cells Animal Cells  No Cell Wall  No Chloroplasts  Irregular Shape  Many small Vacuoles  Centrioles  Lysosomes Plant Cells  Cell Wall  Chloroplasts  Regular Shape  One large vacuole  No centrioles  No Lysosomes

8. Cell Organization Cells>Tissues>Organs>Systems Cells: The basic unit of life Tissues: A group of cells functioning together to perform an activity Organs: Groups of two or tissues working together Systems: A group of organs working together to carry out major life functions