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12th Grade IB Biology
11th Grade IB Biology
Evidence for Cell Theory
Cell theory is based upon the following evidence:
-The use of an early microscope by Robert Hooke to look at a piece of cork and called what he saw (dead cells) as Cells (1663)
-In 1673, Anton van Leeuwenhoek saw bacteria and protoza through his microscope
-In 1833, Robert Brown discovered the nucleus
-In 1838, Dr. Schleiden published a paper stating that the nucleus was the most important part of the cell and the basic structure from which the rest of the cell developped.
-In 1939, Dr Theodor Schwann published a book in which he stated that there was a link between animal and plant cells: the nucleus. This spawned what is now known as the cell theory
-The final addition was from Rudolph Virchow. he stated that all cells come from other cells.
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