Which description matches the quaternary structure of a protein?
Answer and explanation
Correct answer: A. The arrangement of two or more polypeptide chains into one functional protein
- Step 1: Primary is the sequence, secondary is helices and sheets, tertiary is the 3D fold of one chain.
- Step 2: Quaternary applies only when multiple polypeptides combine, as in haemoglobin with four chains.
Answer
arrangement of two or more polypeptides.
Why not the others: The other options describe primary, secondary and tertiary structure respectively.
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