35. Which one of the following statements relating to lipids and membranes is correct? (A) Triacylglycerols are the major component of most cell membranes. (B) Clusters of cholesterol molecules are generally used to provide ion channels. (C) Na+ and K+ ions readily diffuse through the lipid bilayer. (D) Both saturated and unsaturated fatty acyl groups are used in typical phospholipids. (E) All phospholipids incorporate a glycerol unit as part of their structure.