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The Cell Theory

The Cell Theory. Microscopes Provide the Windows to the World of the Cell. Anton Van Leeuwenhoek. ( 1600’s) Credit for the first microscope Looked at pond water and saw “wee beasties”. Robert Hooke. Observed plant stems, wood, and cork (1600’s ) He used a compound scope (series of lenses)

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The Cell Theory

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  1. The Cell Theory Microscopes Provide the Windows to the World of the Cell

  2. Anton Van Leeuwenhoek • (1600’s) • Credit for the first microscope • Looked at pond water and saw “wee beasties”

  3. Robert Hooke • Observed plant stems, wood, and cork (1600’s) • He used a compound scope (series of lenses) • He was the first to use the term “cell” • What cell part did Hooke observe? • Cell Wall

  4. Robert Brown (1833) • Observed that cells had a dark structure within plant cells • Brown observed the nucleus

  5. Matthias Schleiden (1838) • Stated that all plants are made of Cells • Made many observations of plants around the area

  6. Theodor Schwann (1839) • Stated that all animals are made of Cells • Observed many animal tissues

  7. Rudolf Virchow (1855) • Stated that all cells come from pre-existing cells • Cells arise from the division of pre-existing cells

  8. Louis Pasteur (1859) • Disproved the Theory of Spontaneous Generation

  9. Cell Theory • Cell Theory is the unifying theme in biology because it emphasizes the similarity of all living things • All organisms are composed of one or more cells. • Cells are the smallest living units of all living organisms. • Cells arise only by division of a previously existing cell.

  10. Exceptions to the Cell Theory • Viruses – are not cellular • Mitochondria and chloroplast – each contain genetic material and can reproduce

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