You're on the right track! When two amino acids combine, they form a peptide bond. This bond forms between the carboxyl group (COOH) of one amino acid and the amino group (NH2) of another amino acid.

Here's a breakdown:

* Carboxyl group (COOH): This group is acidic and loses a hydroxyl group (OH-) during the reaction.

* Amino group (NH2): This group is basic and gains a hydrogen ion (H+) during the reaction.

The process of forming a peptide bond involves:

1. Dehydration reaction: A molecule of water is removed.

2. Formation of the peptide bond: The carbon atom of the carboxyl group forms a covalent bond with the nitrogen atom of the amino group.

The resulting molecule is called a dipeptide and contains a peptide bond. This process can continue, adding more amino acids to form polypeptides and eventually proteins.