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nmdcat.online June 29, 2026

Histidine is commonly found in enzyme active sites because its imidazole side chain can

A. Form peptide bonds
B. Donate and accept protons near physiological pH
✓
C. Form disulfide bonds
D. Bind DNA specifically

📝 Explanation

Histidine's pKa is close to physiological pH, making it ideal for acid-base catalysis.

📖 Additional Information

  • Form peptide bonds
  • Donate and accept protons near physiological pH
  • Form disulfide bonds
  • Bind DNA specifically

Histidine's pKa is close to physiological pH, making it ideal for acid-base catalysis.

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