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nmdcat.online June 27, 2026

When an enzyme’s activity is plotted against pH, a bell-shaped curve is typically observed because

A. Enzyme activity increases linearly with increasing pH indefinitely
B. The ionic state of the active site residues is optimal at a specific pH
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C. pH has no effect on the enzyme's secondary structure
D. The substrate concentration also changes with pH

📝 Explanation

The active site catalytic residues often depend on specific ionization states to function. At the optimum pH, these residues have the correct charge (+ or -) for substrate binding or catalysis. Deviation from this pH alters the ionization, disrupting the interactions and decreasing activity.

📖 Additional Information

  • Enzyme activity increases linearly with increasing pH indefinitely
  • The ionic state of the active site residues is optimal at a specific pH
  • pH has no effect on the enzyme's secondary structure
  • The substrate concentration also changes with pH

The active site catalytic residues often depend on specific ionization states to function. At the optimum pH, these residues have the correct charge (+ or -) for substrate binding or catalysis. Deviation from this pH alters the ionization, disrupting the interactions and decreasing activity.

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