The number of:
1. Aromatic proteinogenic amino acids is 5
2. Carbon atoms in arachidonic acid including carboxyl carbon is 20
3. Fatty acids in cholesterol is 3
4. Polypeptide chains in quaternary structure of haemoglobin is 2
Subtopic:  Lipids: Glycerolipids, Phospholipids & Glycerol |
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From NCERT
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