A haemoglobin molecule is built from four separate polypeptide chains held together as one functional molecule. Which level of protein structure does this represent?

Model answer

quaternary

Also accepted: quaternary structure, quartenary

Explanation: Quaternary structure exists only in proteins made of more than one polypeptide chain. Haemoglobin has four, so its working shape depends on how those four subunits fit together, not just on how each one folds.

Derived from ZIMSEC Biology Paper 2, Nov 2004, Q1

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A haemoglobin molecule is built from four separate polypeptide chains held together as one functional molecule. Which level of protein structure does this represent?

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