When two protein chains combine to form an active protein,the structural level is ________.

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The quaternary level refers to the structure formed by the combination of two or more protein chains (subunits) to form a functional protein. The primary level refers to the linear sequence of amino acids in a single protein chain. The secondary level refers to local folding patterns, such as alpha helices and beta sheets, within a protein chain. The tertiary level refers to the overall 3D structure of a single protein chain. The pleated level is not a recognized level of protein structure.

When Two Protein Chains Combine to Form an Active Protein,the