The bonds that are created during the formation of the primary structure of a protein are known as peptide bonds. The repeating units of proteins are amino acids. Structurally, an amino acid consists of a central carbon atom that is linked to a carboxyl group, a side chain, a hydrogen atom, and an amino group.
During the formation of proteins, more amino acids are linked together by peptide bonds in order to form a long chain. This usually occurs via a chemical reaction known as a condensation reaction. This process entails the joining together of the amino group of one amino acid and the carboxyl group of another amino acid.
This process continues until a long chain compound (protein) is formed. When a peptide bond links the amino group of one amino acid and the carboxyl group of another amino acid together, a molecule of water is removed. The primary structure of a protein consists of a linear sequence of amino acids.