Cell Discovery

1. Cell Discovery

2. Anton von leeuwenhoek First microscope used to view organisms • Dutch tradesman and self-prescribed scientist 1660’s • “Father of microscopy” • Improved the microscope (worked with glass) • First to see living things in a drop of water - “animicules”

3. Robert Hooke 1665 Cork Cells Coined the term “CELL” His work was accepted in the scientific community His work was published including many illustrations

4. CELL THEORY In 1839: Schleiden & Schwann 1. All living things are made of cells 2. Cells are the basic unit of structure and function in living things In 1858: Virchow 3. All cells come from pre-existing cells • Rudolf • Rudolf Virchow • (physician) MattiasSchleiden (Botanist) Looked at plant cells Theodor Schwann (Physiologist) Looked at animal cells

5. Additions to cell theory 4. All cells contain hereditary information that is passed from cell to cell during cell division. 5. All cells have a similar chemical composition Plant cell Animal cell (white blood cells)

6. Other important characteristics of cells • They are the smallest unit of living things • Most are .01 - .02 mm • The small size allows for movement of materials across membranes • The largest cell is an egg • Cells in many celled organisms have special jobs – they are shaped to fit their job

7. Two types of cells • Prokaryote • Eucaryote