Question

select the statement that explains how the reaction rate is affected if the concentration of the substrate is reduced from 2000 to 500.
the reaction rate stays the same.
the reaction rate increases.
the reaction rate decreases.

Explanation:

In general, for enzyme - catalyzed reactions (and many chemical reactions), as the substrate concentration decreases within the non - saturated range of the enzyme, the number of available substrate molecules for the enzyme to act on reduces. This leads to fewer enzyme - substrate complexes being formed, thus decreasing the reaction rate. Looking at the graph, reducing the substrate concentration from 2000 to 500 is in a region where the reaction rate is dependent on substrate concentration.

Answer:

The reaction rate decreases.