Concept 6.2 Membranes Organize a Cell's Activities
pp. 115-117 text reading
Biology:   Exploring Life by Campbell, et al.

Use complete sentences to answer the following questions.

1.)   Which substances compose most of the plasma membrane?
2.)   Explain how the phospholipid bilayer helps the membrane be a selective barrier.
3.)   List three functions of membrane proteins.
4.)  What is a specific function of transport proteins?