Meet the Scientists Developing the Cell Theory

What is a cell?

• The cell is a basic building block of living things, both plant and animal.

All living things have cells.

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Plants

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Animals

Cell Theory

• All organisms are composed (made up of) cells.

Tool used to view cells

Timeline - 1590

• Hans and Zacharias Janssen (1590), Dutch glasses makers, father and son. Produced first compound microscope (2 lenses).

1590 Hans & Zacahrias Janssen Produced 1 st compound microscope

Timeline- 1665

• Robert Hooke (1665), English Father of Microscopy, looked at a thin slice of cork through a compound microscope and observed tiny, hollow room like structures. He called them cells, but only saw the outer cell walls because the cork cells were not alive.

First to see cells in a piece of cork Robert Hooke 1590 Hans & Zacahrias Janssen Produced 1 st compound microscope 1665

Timeline-1680

• Anton van Leeuwenhook (1680), Dutch Amateur Scientist, Father of Microscopy, first to see and describe bacteria, yeast, organism in pond water, and blood cells

1590 First to see cells in a piece of cork Robert Hooke 1680s Hans & Zacahrias Janssen Produced 1 st compound microscope 1665 Anton van Leeuwenhoek First to observe living cells; Father of Microscopy

Timeline-1838

• Matthias Schleiden (1838), German Botanist, viewed plant parts under a microscope and discovered that they are made of cells.

1590 First to see cells in a piece of cork Robert Hooke 1680s 1838 Hans & Zacahrias Janssen Produced 1 st compound microscope 1665 Anton van Leeuwenhoek First to observe living cells; Father of Microscopy Matthias Schleiden Discovered plants are made of cells

Timeline-1839

• Theodor Schwann (1839), German Zoologist, viewed animals parts under a microscope and discovered that they are made of cells.

1590 First to see cells in a piece of cork Robert Hooke 1680s Discovered animals are made of 1838 cells Theodor Schwann Hans & Zacahrias Janssen Produced 1 st compound microscope 1665 Anton van Leeuwenhoek First to observe living cells; Father of Microscopy Matthias Schleiden Discovered plants are made of cells 1839

Timeline- 1855

• Rudolph Virchow (1855), German Physician, stated that living cells come only from other living cells.

1590 First to see cells in a piece of cork Robert Hooke 1680s Discovered animals are made of cells Theodor Schwann 1838 1855 Hans & Zacahrias Janssen Produced 1 st compound microscope 1665 Anton van Leeuwenhoek First to observe living cells; Father of Microscopy Matthias Schleiden Discovered plants are made of cells 1839 Rudolph Virchow Stated living cells come from other living cells

CELL THEORY

• Based on the findings of Schleiden, Schwann, and Virchow • All life forms are made from one or more cells • Cells can only be made from other cells • The cell is the smallest form of life