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nmdcat.online June 27, 2026

The quaternary structure of a protein is defined by the

A. Helical folding of the polypeptide backbone
B. Aggregation of two or more folded polypeptide subunits
✓
C. Complete amino acid sequence of a single polypeptide
D. Local interactions between side chains of a single chain

📝 Explanation

Quaternary structure exists only in proteins composed of more than one polypeptide chain (subunit). It describes the specific 3D arrangement and interactions between these individual, folded subunits, as seen in hemoglobin (α2β2).

📖 Additional Information

  • Helical folding of the polypeptide backbone
  • Aggregation of two or more folded polypeptide subunits
  • Complete amino acid sequence of a single polypeptide
  • Local interactions between side chains of a single chain

Quaternary structure exists only in proteins composed of more than one polypeptide chain (subunit). It describes the specific 3D arrangement and interactions between these individual, folded subunits, as seen in hemoglobin (α2β2).

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