1. 3.1 Cell Theory KEY CONCEPT Cells are the Basic unit of life.

2. 3.1 Cell Theory FL NGSSS SC.912.L.14.1* Describe the scientific theory of cells (cell theory) and relate the history of its discovery to the process of science. (MODERATE) SC.912.L.14.3 Compare and contrast the general structures of prokaryotic and eukaryotic cells.

3. 3.1 Cell Theory 1665- Hooke was the first to identify cells, and he named them. 1674- Because he made better lenses, Leeuwenhoek observed cells in greater detail 1838- Schleiden was the first to note that plants are made of cells 1839- Schwann concluded that all living things are made of cells 1855- Virchow- proposed that all cells come from other cells Many scientists contributed to the cell theory.

4. 3.1 Cell Theory The cell theory grew out of the work of many scientists and improvements in the microscope. Many scientists contributed to the cell theory. More was learned about cells as microscopes improved.

5. 3.1 Cell Theory The cell theory grew out of the work of many scientists and improvements in the microscope. Many scientists contributed to the cell theory. More was learned about cells as microscopes improved. The cell theory is a unifying concept of biology.

6. 3.1 Cell Theory Early studies led to the development of the cell theory. The Cell theory has three principles. –All organisms are made of cells.

7. 3.1 Cell Theory Early studies led to the development of the cell theory. The Cell theory has three principles. –All organisms are made of cells. –All existing cells are produced by other living cells.

8. 3.1 Cell Theory Early studies led to the development of the cell theory. The Cell theory has three principles. – –All organisms are made of cells. – –All existing cells are produced by other living cells. – –The cell is the most basic unit of life.

9. 3.1 Cell Theory Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells. All cells share certain characteristics.

10. 3.1 Cell Theory Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells. All cells share certain characteristics. – –Cells tend to be microscopic. Bacterium (colored SEM; magnification 8800x)

11. 3.1 Cell Theory Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells. All cells share certain characteristics. – –Cells tend to be microscopic. – –All cells are enclosed by a membrane. Bacterium (colored SEM; magnification 8800x) cell membrane

12. 3.1 Cell Theory Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells. All cells share certain characteristics. – –Cells tend to be microscopic. – –All cells are enclosed by a membrane. – –All cells are filled with cytoplasm. Bacterium (colored SEM; magnification 8800x) cell membrane cytoplasm

13. 3.1 Cell Theory There are two cell types: eukaryotic cells and prokaryotic cells.

14. 3.1 Cell Theory There are two cell types: eukaryotic cells and prokaryotic cells. Eukaryotic cells have a nucleus. nucleus cell membrane

15. 3.1 Cell Theory There are two cell types: eukaryotic cells and prokaryotic cells. Eukaryotic cells have a nucleus. Prokaryotic cells do not have membrane- bound organelles. nucleus cell membrane organelles

16. 3.1 Cell Theory There are two cell types: eukaryotic cells and prokaryotic cells. Prokaryotic cells do not have a nucleus. nucleus cell membrane organelles

17. 3.1 Cell Theory There are two cell types: eukaryotic cells and prokaryotic cells. Prokaryotic cells do not have a nucleus. Prokaryotic cells do not have membrane-bound organelles. nucleus cell membrane organelles cytoplasm