Question

which is an example of saturation of an enzyme - catalyzed reaction? the number of substrate molecules is much smaller than the number of available enzyme molecules. the number of substrate molecules is much larger than the number of available enzyme molecules. the number of product molecules is in equilibrium with the number of substrate molecules. the number of substrate molecules is much larger than the number of product molecules. the number of product molecules is much larger than the number of substrate molecules.

Explanation:

In an enzyme - catalyzed reaction at saturation, the enzyme is fully occupied with substrate molecules. This means the number of substrate molecules is much larger than the number of available enzyme molecules. When the enzyme active sites are all filled with substrate, adding more substrate does not increase the reaction rate as the enzyme is already saturated.

Answer:

The number of substrate molecules is much larger than the number of available enzyme molecules.