Determine whether each of the following amino acids is polar and neutral, nonpolar, basic, or acidic. Which of the following statements about peptide bonds are true? Peptide bonds are amide linkages. Peptide bond formation is a hydrolysis reaction. Peptides are polymers of proteins. Peptide bonds form from nucleophilic attack by an electron pair on an Alpha-amino nitrogen atom on an Alpha-carboxyl carbon atom of another amino acid. A tetrapeptide contains five amino acid residues.