1. Unit #3: Cells
Chapter #7 pg. 168

2. The Inner Life of the Cell

3. How did Cells Arise? Aristotle and Abiogensis
Redi’s Experiment
Aristotle and Abiogensis
Abiogensis – non-living objects spontaneously transform into living objects
based this on the fact that flies were always on rotting meat so the flies must have come from the meat.
Jean Helmont concluded that mice came from grains of wheat and a dirty shirt. He found that if he placed grains of wheat and a dirty shirt in a container, mice would appear in 21 days

4. The Cell Theory All living things are made up of one or more cells
Cell is the functional unit of life
All living cells come from pre-existing cells

5. A group of cells make up a tissue (eg. muscle)
A group of tissues make up an organ (eg. heart)
A group of organs make up a system. (eg. circulatory)
A group of systems make up an organism (eg. human)

6. Cell Types Cells vary in size from about 5-50µm
Physical limitations on the flow of nutrients and wastes in and out of the cell prevent it from becoming larger
(Surface area : volume ratio)

7. Prokaryotic A Cell that lacks a nucleus and membrane bound organelles
Usually small and unicellular
Have DNA and ribosomes
Eg. bacteria

8. Eukaryotic
A cell that contains a nucleus and other membrane bound organelles
Can be unicellular or multicellular
Eg. paramecium

9. Eukaryotic organisms can be divided into 2 main types: Plant vs Animal Cell
Differences:
Plant cells have chloroplasts and other plastids
Plant cells have cell walls for rigidity
Plant cells have large vacuole; Animals have small vesicles
Plant cells do not have lysosomes or centrioles