The History of Cell Biology 1 What is

The History of Cell Biology 1

What is a cell? �Def. - a cell is the smallest structural and functional unit of an organism. �A self-replicating unit that may exist independently (unicellular organisms) or as a sub-unit in a multi-cellular organism. �Specialized into carrying out particular functions towards the cause of the organism as a whole. 2

Which of the following are comprised of cells? 3

Which of the following are comprised of cells? 4

Robert Hooke � In 1665 he was the first to use the word cell. �Hooke looked at the cells in a cork. 5

Anton Von Leeuwenhoek �First person to Drawings of Bacteria in the mouth observe living cells (1674). �He observed protists. �Remember: �Leeuwenhoek Li ving 6

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Matthias Schleiden �First to state that all plants are composed of cells (1838). �Remember: �Sch. Leiden p. Lant s 8

Theodor Schwann �First to state that animals are made of cells (1839). �Remember: �Schw. Ann Ani mals 9

Rudolf Virchow �Proposed that cells come from other existing cells (1855). 10

The development of the cell theory �Hooke- first to use the word cell. �Leeuwenhoek-first to observe living cells. �Schleiden- stated plants are made of cells. �Schwann-stated animals are made of cells. �Virchow-stated all cells come from other cells. 11

Cell Theory �All living organisms are composed of one or more cells. �Cells are the basic units of structure and function in an organism �Cells come only from the reproduction of existing cells. 12

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