The Cell Theory Notes Title: The Cell Theory (pg. 11) At top of page write the 3 Cell Theory postulates and box them. 1. All living things have cells List the following scientists, skipping 3-4 lines between each and take notes on each scientists. 2. Cells come 1. Hooke from other cells 2. Leeuwenhoek 3. Schleiden 4. Schwann 3. Cells are the 5. Virchow basic unit of life The Discovery of the Cell Robert Hooke • looked at thin slices of cork (plant cells) under the microscope. 1665 • Named it a cell Anton van Leeuwenhoek – late 1600’s He was the first to: 1. See and describe microorganisms ( bacteria, 1-celled creatures) under the microscope. 2. He observed microorganisms in a drop of pond water, dental scrapings, etc. Leeuwenhoek made many simple microscopes On the road to the cell theory... Matthias Schleiden Theodore Schwann German botanist Zoologist 1838 1839 Together they created postulate that “A cells come from other cells.” Schleiden said that all plants are Schwann said that all animals are made of cells. made of cells. Virchow In 1858, Rudolph Virchow said that cells could only arise from preexisting cells. Microscopic view of a 1. All living things have cells Human Skin Sample Look at the pictures and notice the living organisms all have a cell structure, while the none living organism do not have a cell structure. 2. Cells come from other cells. Cell undergoing cell division 3. Cells are the basic unit of life Levels of Organization The pictures to the right are • Atoms No level organelles or parts of the smaller than • Elements cell. These organelles are the level of cell • Molecules not considered alive because is considered they are considered a • alive. Compounds smaller level of organization • Cells than the cell. • Tissue • Organ • Organ System • Organisms The Cell Theory 1. All living things are composed of cells. 2. Cells are the basic units of living things. 3. New cells are produced from existing cells..