The Existence of a Concentration Gradient of Glucose Across a Membrane

Multiple Choice

The existence of a concentration gradient of glucose across a membrane means that

A) there is a high concentration of glucose on both sides of the membrane.
B) the glucose molecules are more crowded on one side of the membrane than on the other.
C) there is a high concentration of water on both sides of the membrane.
D) the glucose molecules are chemically bonded more tightly on one side of the membrane than on the other.
E) there are more glucose molecules within the bilayer of the membrane than outside of the membrane.