Which of the following statements about a typical plasma (cell) membrane is correct?

A. Carbohydrates on the membrane surface are important in determining the overall bilayer structure.
B. The phosphoplipids of the cell membrane allow almost all molecules to move in and out of the cell.
C. The two sides of the plasma membrane have different protein compositions.
D. The cell membrane is a tough, rigid structure that primarily functions to protect and support the structure of the cell.
E. The interior of the membrane is hydrophilic because it is composed primarily of the fatty acid tails of phospholipids.