Match each biological molecule to the correct description of its structure:
a. Central carbon attached to a hydrogen, an amino group, a carboxyl group, and a variable R group.
b. Contains a pentose (5-carbon) sugar, a phosphate group, and a nitrogenous base.
c. Three fatty acids attached to a glycerol molecule.
d. Two fatty acids attached to a glycerol molecule, plus a phosphorus-containing head group.
1. amino acid
2. nucleotide
3. triglyceride
4. phospholipid
