Question

myristic acid, a fatty acid
c
h
o
n
p
fatty acid tail
phosphatidylcholine, one type of phospholipid
according to the models, which elements are found in this phospholipid but not in all lipids?
phosphorus
oxygen
carbon
nitrogen
hydrogen

Explanation:

1. First, identify elements in the fatty acid (a simple lipid): myristic acid contains carbon (C), hydrogen (H), and oxygen (O). These are universal to all lipids.
2. Next, identify unique elements in the phosphatidylcholine (phospholipid): it contains nitrogen (N) and phosphorus (P), which are not present in the basic fatty acid structure.
3. All lipids contain C, H, O, but only phospholipids (a subset of lipids) have N and P, so these are not found in all lipids.

Answer:

phosphorus, nitrogen