Carboxylic acid group of one amino acid and amine group of another amino acid create what functional group?

Question

Carboxylic acid group of one amino acid and amine group of another amino acid create what functional group? Condensation is a chemical reaction in which two substances combine to form a larger molecule with the release of a small molecule such as what?

Answer 1

The carboxylic acid group of one amino acid and the amino group of another amino acid combine to liberate a molecule of water (H2O) and form peptide bond.  This is also referred to as an amide linkage.  The small molecule referred to in the question is the aforementioned water molecule.