A covalently bonded group of three amino acids is called a tripeptide.

Here's a breakdown:

* Amino acids: The building blocks of proteins.

* Peptide bond: The covalent bond that links amino acids together.

* Dipeptide: Two amino acids joined by a peptide bond.

* Tripeptide: Three amino acids joined by peptide bonds.

* Polypeptide: A long chain of amino acids joined by peptide bonds.

* Protein: A functional molecule made up of one or more polypeptide chains.