Question: Which statement about sphingolipids is TRUE? Need Assignment Help? Question options: a) Two hydroxyl groups of ceramide serve as sites for different substituents. b) Only sphingomyelin and cerebroside contain carbohydrate substituents. c) All three classes of sphingolipids contain carbohydrate substituents. d) Condensation of palmitoyl CoA and serine followed by oxidation, acylation, and reduction yields ceramide. e) Condensation of palmitoyl CoA and serine followed by reduction, acylation, and oxidation yields ceramide.