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nmdcat.online June 27, 2026

In an enzymatic reaction, the initial velocity (V0) of the reaction is directly proportional to the enzyme concentration, provided that the substrate concentration is

A. Well below the Michaelis constant (Km)
B. Exactly equal to the Michaelis constant (Km)
C. In significant excess and saturating
✓
D. Decreasing over time

📝 Explanation

When [S] is saturating (>> Km), all enzyme active sites are occupied, and the reaction rate is solely a function of how fast the enzyme can process substrate (Vmax). Vmax is proportional to the total enzyme concentration, so doubling the enzyme doubles V0 under these conditions.

📖 Additional Information

  • Well below the Michaelis constant (Km)
  • Exactly equal to the Michaelis constant (Km)
  • In significant excess and saturating
  • Decreasing over time

When [S] is saturating (>> Km), all enzyme active sites are occupied, and the reaction rate is solely a function of how fast the enzyme can process substrate (Vmax). Vmax is proportional to the total enzyme concentration, so doubling the enzyme doubles V0 under these conditions.

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