Multiple Choice
Draw a glycerophospholipid with lauric acid at C1, myristic acid at C2, and choline bonded to phosphate.
23. Lipids
Glycerophospholipids
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Which one of the following statements accurately describes the difference between cephalins and lecithins?
A
Cephalins contain saturated fatty acids while lecithins have unsaturated fatty acids.
B
Lecithins and cephalins have different backbone molecules.
C
The head groups in cephalins and lecithins are ethanolamine and choline, respectively.
D
Lecithins do not have a head group.
Verified step by step guidance1
Begin by understanding the basic structure of phospholipids, which include a glycerol backbone, fatty acid chains, and a phosphate group with a head group.
Recognize that both cephalins and lecithins are types of phospholipids, but they differ in their head groups.
Cephalins have ethanolamine as their head group, while lecithins have choline as their head group. This is the key difference between the two.
Note that both cephalins and lecithins can contain either saturated or unsaturated fatty acids, so the statement about fatty acids is not accurate.
Understand that lecithins do indeed have a head group, which is choline, contradicting the statement that lecithins do not have a head group.
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