Meet the Scientists Developing the Cell Theory

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Meet the Scientists Developing the Cell Theory
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What is a cell?

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

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Cell Theory

• All living things are made up of cells.
• Cells are the smallest working units of all
  living things.
• All cells come from preexisting cells through
  cell division.

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Tool used to view cells
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All living things have cells.

• Plants

• Animals

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Timeline - 1590

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

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Timeline- 1665

• Robert Hooke (1665), English Scientist, 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.

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Timeline-1680

• Anton van Leeuwenhook (1680), Dutch Amateur
  Scientist, looked at blood, rain water and
  scrapings from teeth through a simple microscope.
  He called these bacteria, animalcules. Bacteria
  are Prokaryotic

Leeuwenhook ???
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Timeline-1838

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

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Timeline-1839

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

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Timeline- 1855

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

Plant Cells
Animal Cells