Cell Membranes Problem Set
Problem 1: Membrane components
Tutorial to help answer the question
The ____ portion of the cell membrane functions as a barrier while the ____ portion determines specific functions, including pumps, receptors, adhesion, etc.
Proteins of membranes are divided into two general classes:
Transport of polar molecules through the cell membrane usually requires channels made up of proteins that span the lipid bilayer. Thus, we associate the majority of functional properties of cell membranes with the membrane proteins. The lipid is predominately a barrier. Later we shall see that both lipids and proteins of membranes can function in cell signaling.
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Department of Biochemistry and Molecular Biophysics
University of Arizona
Revised: August 2004
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