Chapter 20.4, Problem 9P

a)

Interpretation Introduction

Interpretation:

The structures of different sphingomyelins have to be given.

Concept Introduction:

Sphingolipids:

• It is the major lipid components in the myelin sheaths of nerve fibers.
• An amino alcohol called sphingosine instead of glycerol forms the sphingolipids.
• The two main classifications of sphingolipids are sphingomyelins and cerebrosides.

Sphingomyelin and cerebroside:

• The primary $\text{OH}$ group of sphingosine is bonded to phosphocholine or phosphoethanolamine in sphingomyelin.
• The primary $\text{OH}$ group of sphingosine is bonded to a sugar residue through a $\beta$-glycosidic linkage in cerebroside.

b)

Interpretation Introduction

Interpretation:

The structure of galactocerebroside has to be given.

Concept Introduction:

Sphingolipids:

• It is the major lipid components in the myelin sheaths of nerve fibers.
• An amino alcohol called sphingosine instead of glycerol forms the sphingolipids.
• The two main classifications of sphingolipids are sphingomyelins and cerebrosides.

Sphingomyelin and cerebroside:

• The primary $\text{OH}$ group of sphingosine is bonded to phosphocholine or phosphoethanolamine in sphingomyelin.
• The primary $\text{OH}$ group of sphingosine is bonded to a sugar residue through a $\beta$-glycosidic linkage in cerebroside.