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3.1 Cell Theory 
KEY CONCEPT Cells are the Basic unit of life.
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.
3.1 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.
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.
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.
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.
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.
3.1 Cell Theory 
Prokaryotic cells lack a nucleus and most internal 
structures of eukaryotic cells. 
• All cells share certain characteristics.
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)
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. 
cell membrane 
Bacterium 
(colored SEM; magnification 8800x)
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. 
cell membrane 
Bacterium 
cytoplasm 
(colored SEM; magnification 8800x)
3.1 Cell Theory 
There are two cell types: eukaryotic cells and prokaryotic 
cells.
3.1 Cell Theory 
There are two cell types: eukaryotic cells and prokaryotic 
cells. 
• Eukaryotic cells have a 
nucleus. 
nucleus 
cell membrane
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 
organelles 
cell membrane
3.1 Cell Theory 
There are two cell types: eukaryotic cells and prokaryotic 
cells. 
• Prokaryotic cells do not 
have a nucleus. 
nucleus 
organelles 
cell membrane
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 
nucleus 
have membrane-bound 
organelles. 
organelles 
cell membrane 
cytoplasm

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Bio ch03 1 (1)

  • 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 Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells. • All cells share certain characteristics.
  • 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. cell membrane 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. – All cells are filled with cytoplasm. cell membrane Bacterium cytoplasm (colored SEM; magnification 8800x)
  • 12. 3.1 Cell Theory There are two cell types: eukaryotic cells and prokaryotic cells.
  • 13. 3.1 Cell Theory There are two cell types: eukaryotic cells and prokaryotic cells. • Eukaryotic cells have a nucleus. nucleus cell membrane
  • 14. 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 organelles cell membrane
  • 15. 3.1 Cell Theory There are two cell types: eukaryotic cells and prokaryotic cells. • Prokaryotic cells do not have a nucleus. nucleus organelles cell membrane
  • 16. 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 nucleus have membrane-bound organelles. organelles cell membrane cytoplasm