Chapter 7 -The Basis of Life (Cell Theory)

Scientist, Year, Contributions, 3 Points in Cell Theory

List all the scientists we talk about (12)

• Aristotle

• Hooke

• Redi

• Leeuenhoek

• Shleiden and Shwann

• Jansen

• Needham

• Spallanzani

• Brown

• Pasteur

• Virchow

Trick to remember:

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Aristotle (Year, contribution)

• 350 BCE

• Believed in Spontaneous generation (life came from non-living things)

Zacharias Janssen (Year, contribution)

• 1590

• Invented the first compound microscope with 2 lenses

Robert Hooke (Year, contribution)

• 1665

• Looked at cork under a microscope, saw box like structures —> named them “Cells”

Francesco Redi (Year, contribution)

• 1668

• Proved maggots didn’t just spawn in meat

Antony Van Leeuenhoek (Year, contribution)

• 1674

• Improved the microscope (single lense design)

• First to see living cells —> called them “animalcules”

M.J Shleiden and Thmas Shwann (Year, contribution)

• 1839

• Shleiden said “all plants are made of cells”

• Shwann said “all animals are made of cells”

• Came together, developed the basis of the first 2 parts of cell theory

John Needham (Year, contribution)

• 1745

• Boiled broth, transfer & sealed —> organisms grew

• Thought he proved spontaneous generation

Lazzaro Spallanzani (Contribution)

• Broth experiment, but sealed THEN boiled, no air in, no organism.

Robert Brown (Year, contribution)

• 1833

• Took microscope and saw the nucleus of the cell

Louis Pasteur (Year, contribution)

• 1850s-60s

• Broth experiment with Swan Neck Flask

• Organisms were only at the end of the flasks

• Disproved spontaneous generation

Rudolf Virchow (Year, contribution)

• 1858

• said “all cells come from pre-existing cells”

• Skin cells only grow where there were skin cells, algae cells only came from where there were algae cells.

The 3 points of the classical cell theory?

1. All living things are made from cells

2. The cell is the basic unit of structure & function in living things

3. Cells come from pre-existing cells

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I WILL PASS THE TEST I WILL PASS THE TEST I WILL PASS THE TEST I WILL PASS THE TEST I WILL PASS THE TEST I WILL PASS THE TEST I WILL PASS THE TEST I WILL PASS THE TEST I WILL PASS THE TEST I WILL PASS THE TEST I WILL PASS THE TEST