Pages where the answers may be found in the newer edition will appear second and are indicated in
bold print.

1.    Name two major functions of the cell membrane.  (p. 113) (p. 120)
2.    What is the specific name of the lipids making up the cell membrane?
       What do these lipids have a special attraction for?  (p. 113) (p. 120)
3.    What is a major job of proteins in the cell membrane?  (p. 114) (p. 121)
4.    Why is the model of the cell membrane called the fluid mosaic model? (p. 114) (p. 121)
5.    What is meant by the term selective permeability?  (p. 115) (p. 121)
6.    Define the term diffusion.  (pp. 115-116) (pp. 122-123)
7.    What is a concentration gradient?  (p. 116) (p. 123)
8.    Why is the process of diffusion sometimes called passive transport? (p. 116) (p. 123)
9.    Define the term osmosis.  (p. 116) (p. 123)
10.  Describe the process of plasmolysis.  (p. 116) (p. 123)
11.  Explain why putting celery or lettuce in fresh water often makes it crisp.  (p. 117) (pp. 123-124)
12.  Define the term active transport.  (p. 117) (p. 124)
13.  Why is energy required for active transport to take place across a cell membrane?
       (thought question p. 117) (thought question p. 124)
14.  Why is energy not required for passive transport to occur?  (thought question) (thought question)