1. The Cell Theory

2. The Cell The basic unit of structure and function of living things. – There are two main types of cells. – There are two main types of organisms based on number of cells.

3. Prokaryote Cells that do not have a nucleus No membrane-bound organelles

4. Eukaryote Cells that have a nucleus surrounded by a nuclear membrane

7. Unicellular Organism composed of one cell

8. Multicellular Organism composed of many cells

10. spontaneous generation – an old theory that proposed living things could come from non- living matter. vocabulary word!

11. the cell theory – describes the basic characteristics of all cells. vocabulary word!

12. The Cell Theory 1. All organisms are made of cells. 2. Cells are the basic units of structure and function for all living things. 3. All cells come from other cells.

13. Using the microscope, many scientists were able to come together and agree upon the parts of the cell theory. As new and more powerful microscopes are created, we learn even more about cells.

14. Important Scientists How do we know about cells? Many important scientists aided in the discovery of the cell and the formulation of the cell theory. The microscope had to be invented

15. Zacharias Janssen 1580-1638 Dutch scientist Built a compound microscope with his father in 1595.

16. Anton Von Leeuwenhoek 1632-1723 Dutch scientist that made the first simple microscope. Discovered bacteria.

17. Robert Hooke 1635-1703 Came up with the word "cell" after studying cork under the microscope. Wrote Micrographia.

18. Robert Remak 1815-1865 Suggested that spontaneous generation was false.

19. Matthias Schleiden 1804-1881 German botanist who concluded that all plants are made of cells.

20. Theodor Schwann 1810-1882 German physiologist that concluded all animals are made of cells. Proposed that the cell was the smallest functioning unit of life.

21. Rudolf Virchow 1821-1902 German histologist that concluded all cells come from other cells. Helped disprove Spontaneous Generation.