Cells and Cell Theory.

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Students Will: summarize the contributions scientists have made toward the cell theory state the cell theory.
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Presentation transcript:

Cells and Cell Theory

Leeuwenhoek • 1673-1723 Anton van Leeuwenhoek described livemicroorganisms observed in teethscrapings, rain water,and peppercorninfusions.

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 microscopeproposed that all animals are composed of cells • Together they stated: – Cells are the elementary particle of all livingorganisms – All cells are alive – independent to the organisms to which they belong

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

Cell Theory Cell Theory * • All living things 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 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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