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Cells and Cell Theory

Cells and Cell Theory. Leeuwenhoek. • 1673-1723 Anton van Leeuwenhoek * described live microorganisms observed in teeth scrapings, rain water ,and peppercorn infusions. The First Observations. • 1665 Robert Hooke – reported that living things were composed of little

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Cells and Cell Theory

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  1. Cells and Cell Theory

  2. Leeuwenhoek • 1673-1723 Anton van Leeuwenhoek * described live microorganisms observed in teeth scrapings, rain water ,and peppercorn infusions.

  3. The First Observations • 1665 Robert Hooke • – reported that living things were composed of little boxes or cells.

  4. Schleiden & Schwann • Development of the CELLTHEORY • • Matthias Schleiden (1838) – using a microscope proposed that all plants are composed of cells • • Theodor Schwann (1839) – using a microscope proposed that all animals are composed of cells • • Together they stated: • – Cells are the elementary particle of all living organisms • – All cells are alive – independent to the organisms to which they belong

  5. Virchow • • 1858, Rudolf Virchow • said cells arise from preexisting cells.

  6. Cell Theory Cell Theory • 1. All living things are composed of one or more cells • 2. Cells are the basic units of structure and function in an organism • 3. Cells come only from the reproduction of preexisting cells * Named for the Monk prayer cells

  7. Cells • Eukaryotic versus Prokaryotic Cells • • Prokaryotic - Cells lacking a nucleus. • • Eukrayotic - Cells containing a nucleus. Organelles - Membrane-bound bodies found within eukaryotic cells.

  8. Types of Cells • Two Basic Types of Cells • Prokaryotes: prounounced: pro-carry-oats • Eukaryotes – Proun: you-carry-oats

  9. Eukaryotes Eukaryotes • Larger more complex cells that make up most familiar life forms: • plants, animals, fungi, algae • Surrounded by a cell membrane made of lipids

  10. Prokaryotes • Smaller • No true nucleus – loose genetic material • Includes Archaea & Bacteria

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