Which of the following does NOT correctly characterize the plasma membrane?:
a) It creates a barrier between the external and the internal environment.
b) It contains proteins that regulate the transport of hydrophilic molecules.
c) It has hydrophilic phospholipid heads facing the extracellular (ECF) and intracellular (ICF) fluid.
d) It contains protein receptors that allow communication between the intracellular (ICF) and the extracellular (ECF) fluid.
e) It creates a barrier so that hydrophilic molecules cannot freely move through the plasma membrane.