Cell Theory Timeline

Microscope TIMELINE

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First microscope

Zacharias Janssen

1590s

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Microorganisms and Micrographia

Robert Hooke

1665

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Bacteria and protazoa viewed

Antonie VAN lEEUWENHOEK

1673

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Discovered Cell Walls

Discovery of the Nucleus

1884

Nucleus is an organelle where DNA is housed

Robert Brown

1831

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Stem Cell research

1981

Lenses needed to exist before the microscope could be invented.

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• The "jelly" was cytoplasm and is in EVERY cell
• Eukaryotes had a nucleus- where the DNA was housed
• Prokaryotes did not have a nucleus
• Discovered that plant cells have a cell wall

Common characteristics between cells- nucleus and jelly

Brown

Robert Brown's Nucleus discovery

Robert Hooke's microscope

Antonie van Leeuwenhoek's microscope

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• Few people believed these organisms existed
• Began information about Cell Theory
• Discovered cells from cork

Revealed the microscopic world to the public

Published a book about Micrographia

Hooke

• Placed lenses in such a way to help with seeing far away things
• Rearranged the lenses to see microscopic things
• Magnification between 3x and 9x

Built glasses for a living and used his knowledge for scopes

Zacharias got help from his father

Janssen

• Originally called microorganisms "animalcules" or tiny animals
• Observed bacteria and protozoa first
• New advances in technologies, new discoveries
• Magnify things between 70 and 250x

Van Leeuwenhoek

Chapter 4 Quiz on Monday December 9th

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