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primary structure

The primary structure of a biopolymer is the exact specification of its atomic composition and the chemical bonds connecting those atoms (including stereochemistry). For a typical unbranched, un-crosslinked biopolymer (such as a molecule of a typical intracellular protein, DNA, or RNA), the primary structure is equivalent to specifying the sequence of its monomeric subunits, such as amino acids or nucleotides.

The primary structure also represents a protein's linear sequence of polymerized amino acids. The simplest level of protein structure, the primary structure, is simply the sequence of amino acids in a polypeptide chain. Each chain has its own set of amino acids, assembled in a particular order. Many scientists are working on the primary structure to determine the fundamental difference between enzymes.

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