1 3.1 Cell Theory KEY CONCEPT Cells are the Basic unit of life.
2 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.
3 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.
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. The cell theory is a unifying concept of biology.
5 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.
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. –All existing cells are produced by other living 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. – –The cell is the most basic unit of life.
8 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 cytoplasm
9 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)
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. – –All cells are enclosed by a membrane. Bacterium (colored SEM; magnification 8800x) cell membrane
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. – –All cells are filled with cytoplasm. Bacterium (colored SEM; magnification 8800x) cell membrane cytoplasm