Answer the following question given this paragraph: 

Figure 3.19 A phospholipid is a molecule with two fatty acids and a modified phosphate group attached to a glycerol backbone. The phosphate may be modified by the addition of charged or polar chemical groups. Two chemical groups that may modify the phosphate, choline and serine, are shown here. Both choline and serine attach to the phosphate group at the position labeled R via the hydroxyl group indicated in green.


Q: What is a molecule with two fatty acids and a modified phosphate group attached to a glycerol backbone?

 Choices:

- carbohydrate

- polymer

- amino acid

- phospholipid

A:
phospholipid
