Cell Theory Cell Theory Cell theory states 1

Cell Theory

Cell Theory • Cell theory states: 1. All living organisms are composed of cells. They may be unicellular or multicellular. Unicellular = single cell organisms http: //www. infovisual. info/02/003_en. ht ml Multicellular = organisms made up of more than one cell

Cell Theory 2. The cell is the basic unit of structure and function. 3. All cells come from previously existing cells. Exceptions: ______________

Cell Theory Timeline • 1665 - Robert Hooke of England looks through a microscope at a sliver of cork. • He notices what he calls cells. • He is the first person to use the word cell to describe microscopic structures. http: //images. tutorvista. com/content/cell-unitlife/scientist-robert-hooke. jpeg

Cell Theory Timeline • 1674 - Anton Van Leeuwenhoek, of Holland, used microscopes to view many things including pond organisms, bacteria and blood cells. He made careful sketches of what he observed. http: //fiskims. edublogs. org/files/2009/09/Leeuwenhoek. JPG Listed number 1 on the Science Channel’s 100 Greatest Discoveries

Cell Theory Timeline • 1831 - Robert Brown discovers the nucleus of the cell. He stresses its importance in fertilization. http: //science. discovery. com/convergenc e/100 discoveries/big 100/biology. html http: //www. xtimeline. com/__User. Pic_Large/108226/evt 110424021800176. jpg Listed number 2 on the Science Channel’s 100 Greatest Discoveries

Cell Theory Timeline • 1839 - Matthias Schleiden and Theodor Schwann create cell theory. The theory states that all living things are made up of one or more cells. Schleiden publishes his cell theory applying it to plants, while Schwann publishes his applied to animals.

Cell Theory Timeline • 1855 - Rudolf Virchow writes and publishes his aphorism omnis cellula e cellula, which means every cell stems from another cell. He theorizes that all forms of disease come from changes in normal cells. http: //www. pathguy. com/virchow 5. jpg