A) the absorption of fats only
B) the formation of a barrier that is selectively permeable to lipid-soluble molecules only
C) to provide a framework for membrane proteins only
D) to carry water-soluble molecules through a hydrophobic environment only
E) the formation of a barrier that is a selective for lipid-soluble molecules and to provide a framework for membrane proteins

A) sphingolipids
B) cholesterol
C) phospholipids
D) All are membrane lipids.

A) impermeable barrier.
B) freely permeable barrier.
C) selectively permeable barrier.
D) only permeable to water soluble molecules.
E) None of the answers are correct.