(biochemistry) A structure of a biological molecule in which there is a precise sequence or order of monomeric units. It serves as the covalent backbone of biological molecules (such as DNA and proteins).
A primary structure of a protein refers to the linear sequence or order of amino acids (a polypeptide) during the process of protein biosynthesis or translation. The primary structure of a protein determines how the protein will fold into a more advanced structure, such as the unique three-dimensional structure of protein.
See also: protein structure