KEY CONCEPT Cells are the Basic unit of life.

1. KEY CONCEPT Cells are the Basic unit of life.

2. 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. Many scientists contributed to the 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

4. 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. 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. Early studies led to the development of the cell theory. • The Cell theory has three principles. • All organisms are made of cells.

7. 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. 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. Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells. • All cells share certain characteristics.

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

11. cell membrane Bacterium (colored SEM; magnification 8800x) • 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.

12. cell membrane cytoplasm Bacterium (colored SEM; magnification 8800x) • 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.

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

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

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

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

17. nucleus organelles cell membrane cytoplasm • 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.