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nmdcat.online July 11, 2026

For an enzymatic reaction with a fixed enzyme concentration, the relationship between substrate concentration and initial reaction velocity is described by a

A. Sigmoidal curve, indicating cooperativity
B. Straight line, indicating a first-order reaction
C. Hyperbolic curve, showing saturation kinetics as per the Michaelis-Menten model
✓
D. Parabolic curve

📝 Explanation

Non-allosteric enzymes follow Michaelis-Menten kinetics, where the plot of V₀ vs. [S] is a rectangular hyperbola: first-order at low [S] and zero-order at high [S].

📖 Additional Information

  • Sigmoidal curve, indicating cooperativity
  • Straight line, indicating a first-order reaction
  • Hyperbolic curve, showing saturation kinetics as per the Michaelis-Menten model
  • Parabolic curve

Non-allosteric enzymes follow Michaelis-Menten kinetics, where the plot of V₀ vs. [S] is a rectangular hyperbola: first-order at low [S] and zero-order at high [S].

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