Name:____________________________________________ Date



Name:____________________________________________ Date:______________________ Period:_______

Plasma Membrane Structure and Function

1. Describe the fluid mosaic model of the cell (plasma) membrane.

2. List and describe 5 functions of the cell membrane.

| |Function |Description |

|1. | | |

|2. | | |

|3. | | |

|4. | | |

|5. | | |

3. The cell or plasma membrane is made of a variety of molecules including phospholipids, carbohydrates, and proteins. Below is a diagram of a small section of a plasma membrane. Select three different colors and color the coding circles and corresponding structures in the diagram. Then answer the questions that follow, referring to the diagram and your textbook.

|( |Phospholipid Molecules |( |Carbohydrate Molecules |( |Protein Molecules |

[pic]

4. What is the term used for the cell’s interior?__________________________________________________

5. What is the term used for the cell’s exterior? _________________________________________________

6. What type of protein is E?_________________________________________________________________

7. What is the name for the carbohydrate – rich area indicated by letter A?___________________________

8. What is the importance of letter A in cell interactions?

9. Which area of the phospholipid, B or C, is hydrophobic? _____________________

10. What does hydrophobic mean?

11. What type of protein is D?_________________________________________________________________

12. Membrane proteins perform many tasks. List 6 tasks that proteins perform.

1.

2.

3.

4.

5.

6.

13. List the three types of lipids found in the plasma membrane.

1. 2. 3.

14. Below is a diagram of a phospholipid. Color the hydrophobic area red and the hydrophilic area blue.

-----------------------

Extracellular

Intracellular

15. Define the following:

hydro = ___________________________

- phobic = _________________________

- philic = __________________________

16. List and then describe 3 types of extracellular materials.

1.

2.

3.

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