Which of the following statements about peptide bonds are true?
- A tetrapeptide contains five amino acid residues.
- 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.
- Peptide bonds are ester linkages.
- Peptides are polymers of amino acids.
- Peptide bond formation is a hydrolysis reaction