1. Chapter 7.1~ Life is Cellular Pages 169-172

2. Important “Cellular” Scientists Robert Hooke- 1665 Constructed one of the first light microscopes Looked at dead cork cells Coined the term “cell” because of their appearance

3. Important “Cellular” Scientists Anton van Leeuwenhoek- 1674 Mastered technique of creating lenses Observed living organisms with improved light microscope

4. Important “Cellular” Scientists Matthias Schleiden- 1838 Concludes all plants are made of cells Theodor Schwann- 1839 Concludes all animals are made of cells Rudolph Virchow- 1855 Proposes all cells come from pre- existing cells

5. Cell Theory Schledien, Schwann, and Virchow’s observations laid the foundations for the cell theory. The Cell Theory states: All living things are composed of cells. Cells are the basic units of structure and function in living things. New cells are produced from existing cells.

6. Important “Cellular” Scientists Janet Plowe- 1931 Demonstrates the cell membrane is a physical structure Helps develop understanding of cell structures Lynn Margulis- 1970 Proposes theory of endosymbiosis Helps develop understanding of cell structures

7. Basic Cell Structures Cell Membrane- Thin, flexible barrier around cell Separates the “outside” from the “inside” Cell Wall- Thick, inflexible barrier around cell Surrounds the Cell Membrane

8. Basic Cell Structures Cytosol- Liquid material inside cell Organelle- Specialized structure within cell Cytoplasm- Cytosol plus organelles

9. Basic Cell Structures Nucleus- Internal structure containing cell’s genetic material

10. Prokaryotic versus Eukaryotic Pro- “Before” Eu- “True” -kary- “Nucleus” Prokaryotic = Before Nucleus Eukaryotic = True Nucleus

11. ProkaryoticEukaryotic