In a polypeptide, you would expect a peptide bond to link which pair of atoms between two amino acids?

• A. The $\alpha$-carbon of one amino acid to the $\alpha$-carbon of another amino acid
• B. The side-chain (R-group) carbon of one amino acid to the side-chain (R-group) carbon of another amino acid
• C. The carbonyl carbon of one amino acid to the amino nitrogen of another amino acid
• D. The carboxyl oxygen of one amino acid to the carboxyl carbon of another amino acid

Answer: (C)