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nmdcat.online June 27, 2026

A non-competitive inhibitor’s effect on a Lineweaver-Burk plot of enzyme kinetics is observed as a

A. Decrease in the slope, with Vmax unchanged
B. Change only in the intercept on the substrate axis, with Vmax unchanged
C. Decrease in Vmax, with the Km value remaining unchanged
✓
D. Increase in Vmax, with a decrease in Km

📝 Explanation

On a double-reciprocal plot, a non-competitive inhibitor produces a line that intersects the control line at the x-axis (Km is unchanged), but has a steeper slope and a higher y-intercept (Vmax is decreased). It reduces the number of functional enzyme molecules.

📖 Additional Information

  • Decrease in the slope, with Vmax unchanged
  • Change only in the intercept on the substrate axis, with Vmax unchanged
  • Decrease in Vmax, with the Km value remaining unchanged
  • Increase in Vmax, with a decrease in Km

On a double-reciprocal plot, a non-competitive inhibitor produces a line that intersects the control line at the x-axis (Km is unchanged), but has a steeper slope and a higher y-intercept (Vmax is decreased). It reduces the number of functional enzyme molecules.

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