History of the Cell Theory
Robert Hooke (1665) looked at cork cells w/ a simple compound microscope
Anton van Leeuwenhoek (1674) found living organisms in pond water
Matthias Schleiden (1838) claimed all plants are made of cells
Theodor Schwann (1839) claimed all animals are made of cells
Rudolf Virchow (1855) new cells can only be produced from previously existing cells "Omnis cellula e cellula"...
Cell Theory All living things are made of cells Cells are the basic unit of structure in living things New cells are produced from existing cells
Scientist Summary Scientist Importance Robert Hooke Cork Cells with a simple compound microscope Anton van Leeuwenhoek Living organisms in pond water Matthias Schleiden Plants are made of cells Theodor Schwann Animals are made of cells Rudolf Virchow New cells must come from old cells
Types of Organisms Unicellular – composed of a single cell Multicellular – composed of many cells