Amino acids are the monomers of proteins, distinguished by covalent bonds in their structure.
In the context of biological macromolecules, the structure provided represents an amino acid which is the building block, or monomer, of proteins. Proteins are large molecules composed of chains of amino acids linked together by covalent bonds. This distinguishes proteins from lipids, nucleic acids, and carbohydrates, which have different monomers such as fatty acids, nucleotides, and monosaccharides, respectively.
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