Question

Draw out the 3 most common phospholipids? What group is on the end of sphingomyelin (SM)?

A) A: Phosphatidylcholine, B: Phosphatidylethanolamine, C: Phosphatidylserine; SM: Amino Group
B) A: Phosphatidylinositol, B: Phosphatidylglycerol, C: Phosphatidic Acid; SM: Hydroxyl Group
C) A: Phosphatidylserine, B: Phosphatidylcholine, C: Phosphatidylethanolamine; SM: Phosphate Group
D) A: Phosphatidylglycerol, B: Phosphatidylinositol, C: Phosphatidic Acid; SM: Methyl Group

Answer 1

The three most common phospholipids are phosphatidylcholine, phosphatidylethanolamine, and phosphatidylserine, and sphingomyelin has an amino group on the end.

Step-by-step explanation:

The three most common phospholipids are phosphatidylcholine, phosphatidylethanolamine, and phosphatidylserine. In the case of sphingomyelin (SM), it contains a fatty acid attached to the amino group of sphingosine, making it a type of ceramide. A phosphoric acid unit is also part of the molecule, and choline is attached to this phosphate group, indicating that the correct answer to your question is:

A) A: Phosphatidylcholine, B: Phosphatidylethanolamine, C: Phosphatidylserine; SM: Amino Group

Sphingomyelin is classified as a phospholipid because it contains phosphoric acid, and it is an important component of the myelin sheath surrounding nerve cells.