PPT CELL THEORY

• Robert Hooke

  • 1665 English Scientist
  • discovered cells while looking at a thin slice of cork.
  • He described the cells as tiny boxes or a honeycomb
  • He thought that cells only existed in plants and fungi

  
• Anton van Leuwenhoek

  • 1673
  • Used a handmade microscope to pond scum & discovered single-celled organisms
  • He called them "animalcules"
  • He also observed blood cells from fish, frogs, dogs, and humans
  • Therefore, it was known that cells are found in animals as well as plants

  
• Robert Brown

  • noticed that pollen grains in water jiggled around
  • called "Brownian motion"
  • discovered nucleus
• Matthias Schleiden

  • 1838
  • concluded that all plants are made of cells

  
• THEODOR SCHWANN

  • 1839
  • concluded that all animals are made of cells

  
• RUDOLF VIRCHOW

  • A physician who did research on cancer cells and concluded "Omnis cellula e cellula".
  • "All cells came from pre-existing cells."
• SCIENTIST CONTRIBUTIONS

  A) Robert Hooke

  B) Anton Van Leeuwenhoek

  C) Francesco Redi

  D) dead cork

  E) bacteria

  F) microscopic organism

  G) rainwater

  H) animalcules

  I) Theory of spontaneous Generation

  
• THE 3 BASIC COMPONENTS OF THE CELL THEORY

  • All organisms are composed of one or more cells (Schleiden and Schwann) (1838-1839)
  • The cell is the basic unit of life in all living things (Schleiden and Schwann) (1838-1839)
  • All cells are produced by the division of pre-existing cells (Virchow) (1858)
• Modern Cell Theory

  Modern Cell Theory contains 4 statements, in addition to the original Cell Theory:

  • The cell contains hereditary information (DNA) which is passed on from cell to cell during cell division.
  • All cells are basically the same in chemical composition (Carbon) and metabolic activities.
  • All basic chemical & physiological functions are carried out inside the cells. (movement, digestion, etc)
  • Cell activity depends on the activities of sub-cellular structures within the cell (organelles, nucleus, plasma membrane)
  • Energy flows occurs in the cell