Final answer:
Amino acids are added together to form a peptide bond through a process called dehydration synthesis. The amino group of one amino acid reacts with the carboxyl group of another amino acid, releasing a molecule of water and forming a covalent bond. This process can be repeated to add more amino acids and create a longer peptide chain.
Step-by-step explanation:
When amino acids are added together to form a peptide bond, the amino group of one amino acid reacts with the carboxyl group of another amino acid. This reaction, called dehydration synthesis, results in the release of a molecule of water and the formation of a covalent bond between the two amino acids. This process can be repeated to add more amino acids and lengthen the peptide chain.