According to the fluid mosaic model of cell membranes, which of the following is a TRUE statement about membrane phospholipids?
A) They have hydrophilic tails in the interior of the membrane.
B) They occur in an uninterrupted bilayer, with membrane proteins strictly anchored to the surface of the membrane.
C) They frequently flip-flop from one side of the membrane to the other.
D) They form a viscous fluid through which proteins shift and flow.
E) They are free to depart from the membrane and are dissolved in the surrounding solution.
