Cells and Cell Theory.

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Presentation transcript:

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 boxes or cells.

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

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

* Named for the Monk prayer cells 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

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

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

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

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

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