Cell Membranes Are Said to Be Selectively Permeable Because They

Multiple Choice

Cell membranes are said to be selectively permeable because they

A) allow the free passage of some materials and restrict the passage of
B) others.
C) allow the passage of materials in one direction but not the other.
D) permit the passage of most materials but not of water.
E) Cell membranes are NOT normally selectively permeable.