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Which of the following statements about sphingolipid structure is correct?
Answer
Ceramide is formed by attaching a fatty acid to sphingosine via an amide bond.
Explanation
Sphingolipids use sphingosine rather than glycerol as their backbone. Attachment of a fatty acid forms ceramide through an amide linkage. Sphingomyelin is a phosphate-containing sphingolipid, and the notes identify it as the only sphingolipid in that category that contains phosphate. **Key takeaway:** Sphingosine-based structure distinguishes this lipid family. **Glossary:** Ceramide: sphingosine with an attached fatty acid.
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