Questions:
1. Choose the correct answer and explain why the other ones are incorrect.
Effect of Substrate Concentration
on the Rate of Enzyme Action
Rate of Reaction
0 0.1 0.2 0.3 0.4 0.5
Substrate Concentration (%)
The graph below shows the effect of substrate concentration on the action of enzyme X. This
enzyme is functioning at its optimal temperature, 36°C, and at its optimal pH, 5.5.
When the substrate concentration increases from 0.4% to 0.5%, the rate of the reaction
A. decreases
B. increases
C. remains the same
D. increases, then decreases
of the enzymatic action shown below. (A-E)