Here's how it works:

* Dehydration synthesis: The carboxyl group (-COOH) of one amino acid reacts with the amino group (-NH2) of another amino acid.

* Water molecule is removed: A molecule of water is released as a byproduct of this reaction.

* Peptide bond formation: The carbon atom of the carboxyl group forms a covalent bond with the nitrogen atom of the amino group. This covalent bond is the peptide bond.

This process continues, adding more amino acids to the chain and forming a polypeptide.

Key points about peptide bonds:

* They are strong covalent bonds.

* They are planar (flat) and rigid.

* They have a partial double bond character, which contributes to their rigidity.

* The rotation of the peptide bond is restricted, but the rotation of the bonds on either side of the peptide bond is allowed. This allows for the flexibility and folding of the protein.

Let me know if you'd like more details about the process of peptide bond formation or about how peptide bonds contribute to protein structure!