Describe the two Basic functions of the plasma membrane

The Assignment 1. Describe the two basic functions of the plasma membrane. 2. What specific molecule is typically most abundant on each side of a plasma membrane? Explain how this influences basic membrane structure. (Note: explain means to give physiological reasons why).

3. Draw and label a section of the plasma membrane of a human cell. Your drawing should include: A phospholipid bilayer: – Each phospholipid should include at least one unsaturated, fatty acid tail. – Your plasma membrane should be at least 15-20 phospholipids in length. – Label the outside surface and the inside surface of your bilayer.

(You can write “out” on one side and “in” on the other side.) – Label a phospholipid. – tabel the hydrophilic (polar) head of a phospholipid. – Label the hydrophobic (nonpolar) tails of a phospholipid. – Make one of the phospholipids a glycolipid and Iabel it, “glycolipid.” (Make sure the glycolipid is on the correct surface of the bilayer.) Cholesterol – Draw and label two or more cholesterol molecules within the phospholipid bilayer.

Proteins and glycoproteins – Draw and label membrane proteins, including: – An integral protein that spans the membrane. – Label the polar regions of the integral protein. – Label the nonpolar region of the integral protein. – A peripheral protein. (Make sure it is on the correct surface of the bilayer.) – A glycoprotein.

(Make sure the carbohydrate portion of the glycoprotein extends from the correct surface of the membrane.) – Use a bracket and labelling lines to indicate the following regions of the plasma membrane: – polar – nonpolar Describe one or more functions of the integral proteins. Describe a function of the glycolipids and glycoproteins.