What is the primary structural difference between sphingolipids and glycerolipids?

• A. Sphingolipids are more abundant in eukaryotic cell membranes than glycerolipids.
• B. Sphingolipids contain ester linkages, while glycerolipids contain amide linkages.
• C. Sphingolipids have more variable fatty acids than glycerolipids.
• D. Sphingolipids use a sphingosine molecule as the platform, while glycerolipids use a glycerol molecule.

Answer: (D)