Final answer:
The consecutive order of amino acids in a polypeptide chain represents its primary structure. For example, the pancreatic hormone insulin has two polypeptide chains, A and B, which are linked together by disulfide bonds.
Step-by-step explanation:
The consecutive order of amino acids in a polypeptide chain represents its primary structure. The primary structure of a protein is determined by the specific sequence of amino acids in the polypeptide chain, which is held together by peptide bonds.
For example, the pancreatic hormone insulin has two polypeptide chains, A and B, which are linked together by disulfide bonds. The primary structure of each chain is indicated by three-letter abbreviations that represent the names and order of the amino acids.