18. Amino Acids and Proteins

Consider the amino acids glycine, proline, and lysine.

b. Using three-letter abbreviations for the amino acids, give the sequence for each of the possible tripeptides.

Valine is an amino acid with a nonpolar side chain, and serine is an amino acid with a polar side chain. Draw the two dipeptides that can be formed by these two amino acids. Identify the peptide bond.