Analyze the structural differences between sphingolipids and glycerophospholipids and explain how these differences affect their function in membranes.

• A. Sphingolipids have a sphingosine backbone and two fatty acids, which makes them more flexible and permeable compared to glycerophospholipids.
• B. Sphingolipids have a sphingosine backbone and one fatty acid, which makes them more rigid and less permeable compared to glycerophospholipids.
• C. Sphingolipids have a glycerol backbone and one fatty acid, which makes them more rigid and less permeable compared to glycerophospholipids.
• D. Sphingolipids have a glycerol backbone and two fatty acids, which makes them more flexible and permeable compared to glycerophospholipids.

Answer: (B)