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BIO NMDCAT Proteins
nmdcat.online June 29, 2026

Hemoglobin exhibits a sigmoidal oxygen-binding curve because of

A. Presence of heme
B. High molecular weight
C. Cooperative binding due to quaternary structure
✓
D. Ferric iron

📝 Explanation

Binding of oxygen to one subunit increases affinity of the remaining subunits.

📖 Additional Information

  • Presence of heme
  • High molecular weight
  • Cooperative binding due to quaternary structure
  • Ferric iron

Binding of oxygen to one subunit increases affinity of the remaining subunits.

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