Final answer:
Amino acids can be linked together into long peptide chains to form proteins through the formation of peptide bonds.
Step-by-step explanation:
Amino acids can be linked together into long peptide chains to form proteins through the formation of peptide bonds. The amino group of one amino acid reacts with the carboxyl group of another amino acid, releasing a water molecule and forming a peptide bond. This process can continue to link multiple amino acids together, creating chains called peptides or proteins. The sequence and number of amino acids in a peptide or protein determine its shape, size, and function.