KEY CONCEPT Cells are the Basic unit of life.

1

• KEY CONCEPT Cells are the Basic unit of life.

2

• The cell theory grew out of the work of many
  scientists and improvements in the microscope.

• Many scientists contributed to the cell theory.

3
Anton van Leeuwenhook

• In the 1600s he was the first scientist to
  describe living cells using a simple microscope
  (contained one lens).

4
Robert Hooke

• He was an English scientist who lived at the
  same time as van Leeuwenhoock.
• Hooke was the first to identify cells and name
  them.
• He observed that cork was composed of tiny,
  hollow boxes that he called CELLS.

5
Matthias Schleiden

• German scientist who observed many types of
  plants and determined that all plants consist of
  cells.

6
Theodor Schwann

• German scientist who determined that all animals
  consist of cells.

7

• Rudolf Virchow
• Proposed that all cells come from other cells.

8

• 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.

9

• 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.

10
Before microscopes were invented, diseases were
thought to be caused by curses and supernatural
events.By using microscopes scientists realized
they were entering a new world---one of
microorganisms.Microscopes enabled scientists
to view and study cells.

• The History of the Cell Theory

11

• Early studies led to the development of the cell
  theory.

• The Cell theory has three principles.
• All organisms are made of cells.

12

• 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.

13

• 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.

14

• All cells share certain characteristics.

15

• All cells share certain characteristics.
• Cells tend to be microscopic.

16

• All cells share certain characteristics.
• Cells tend to be microscopic.
• All cells are enclosed
  by a membrane.

17

• All cells share certain characteristics.
• Cells tend to be microscopic.
• All cells are enclosed
  by a membrane.
• All cells are filled with
  cytoplasm.

18

• There are two cell types eukaryotic cells and
  prokaryotic cells.

19

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

20

• There are two cell types eukaryotic cells and
  prokaryotic cells.
• Eukaryotic cells have a nucleus.
• Eukaryotic cells have membrane-
  bound
  organelles.
• (multi-cellular organisms)
• ex. -humans
• -other animals

21

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

22

• 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.
• AKA (Unicellular organisms)
• ex. bacteria
• virus