Compare the structural differences between sphingomyelins and glycerol-based phospholipids.

Sphingomyelins have a sphingosine backbone, whereas glycerol-based phospholipids have a glycerol backbone.

Sphingomyelins and glycerol-based phospholipids both lack a phosphate group.

Glycerol-based phospholipids contain an amide bond similar to sphingomyelins.

Both have identical backbone structures but differ in fatty acid attachment.