Download View PDF

Name
Date
Period
AP Biology: Chapter 7: Membrane Structure and Function
1. What is the main purpose of the cell’s plasma membrane?
2. Define selective permeablility.
3. Why are phospholipids described as amphipathic?
4. Why is the cell’s plasma membrane referred to as a fluid mosaic?
5. How does “freeze‐fracture” work and what does it show?
6. What are models (not the runway kind) and why are they so useful?
7. Explain how membranes maintain their fluidity. What factors can affect the fluidity of
membranes? Say, “fluidity.” Just a neat word, don’t you think?
8. List and describe the two major types of membrane proteins that put the mosaic in the fluid
mosaic model of cell membranes.
9. Describe the following functions of membrane proteins:
a. Transport
b. Enzymatic activity
c. Signal transduction
d. Cell‐cell recognition
e. Intercellular joining
10. How do membrane carbohydrates function as markers that distinguish one cell from another?
11. What is one of the most important emergent properties of the cell’s plasma membrane?
12. What is it about the structure of the cell’s membrane that allows for selective permeability?
13. Which molecules easily cross the cell membrane?
14. How are molecules transported that do not easily cross the cell membrane?
15. Diffusion, a concentration gradient, and passive transport walked into the principal’s
office…finish the joke.
16. Define the following:
a. Osmosis
b. Tonicity
c. Isotonic
d. Hypertonic
e. Hypotonic
f.
Osmoregulation
17. What’s happening to me?!?!?
18. Make a table to show what happens to plant and animal cells that are placed in the following
types of solutions: hypotonic, isotonic, and hypertonic.
19. How does Paramecium osmoregulate? You may not know it, but this is something you really
want to know. In fact, whether you care or not, you’ve reached a crossroads in your journey to
be as awesome as me. Choose the right path and you might just walk the rice paper without
leaving a trace.
20. What is meant by facilitated diffusion?
21. How do active and passive transport differ?
22. The sodium‐potassium pump uses ____________ to pump ____________ out of the cell and
_____________ into the cell.
23. How does the cell membrane generate voltage?
24. Voltage, membrane potential, and the electrochemical gradient…put them together for me.
25. Define cotransport and give an example.
26. Compare exocytosis and endocytosis.
27. Describe an example of receptor‐mediated endocytosis.