Quaternary structure is a level of structure for which biomolecule?

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Quaternary structure describes how multiple polypeptide chains come together to form a functional protein complex. This level of organization is specific to proteins, explaining the arrangement and interactions among subunits that give the protein its final shape and activity. For example, hemoglobin is built from four polypeptide subunits that work together to transport oxygen, while myoglobin has a single polypeptide chain and lacks this level of assembly. Other biomolecules don’t exhibit quaternary structure in the same way: carbohydrates, nucleic acids, and lipids have different structural hierarchies and do not form multi-subunit protein complexes.