1. Chapter 4 : Parts of a cell Cell Theory: 1600’sRobert Hooke – discovered cells

2. Organells; parts or “organs” of cells

3. Nucleus: control center  Nuclear membrane  Chromatin – DNA tangles  Nucleolus – produces ribosomes

4. Plasma or Cell Membrane  Maintains homeostasis  Controls what goes into and out of the cell

5. Cell Wall – Plants and Fungus cells only  Function – protection and support  Made up of cellulose or chitin

6. Cytoplasm  Material that organells are suspended into

7. Endoplasmic Recticulum (ER)  Function – assembly and transport of proteins  Folded system of membranes  Two types of : –Rough ER- ribosomes –Smooth ER

8. Golgi Complex  Function – receives proteins from ER, packages and ships proteins

9. Lysosomes  Function – digestion, (worn out cell parts, food particles, invading bacteria)_

10. Vacuole  Membrane bound organelle, bubble  Function – store food, store waste

11. Mitochondria – Power House  Function: furnish energy by breaking down “food”  Production of ATP

12. Chloroplasts – plants only  Function – photosynthesis, a type of plastid

13. Cilia and flagella- movement  Allows cells to move  Cilia – short hairlike structures surrounding the cell  Flagella - tail

14. Two Types of Cells  Prokaryote –No organells –No nucleus –Ex. Bacteria  Eukaryote –True cells –Have a nucleus and membrane bound structure –All other cells http://www.earthlife. net/prokaryotes/welc ome.html

15. Cell Size  Cells need surface area large enough to allow for the exchange of materials.  Which cell above has the most surface area?  Does it matter if a cells grows too large?