Final answer:
The reaction velocity increases as the substrate concentration increases at relatively low substrate concentrations. However, at high substrate concentrations, the reaction velocity reaches a saturation point and does not increase further.
Step-by-step explanation:
The reaction velocity increases as the substrate concentration increases at relatively low substrate concentrations.
At low substrate concentrations, the active sites of the enzyme are not fully occupied by the substrate molecules. When the substrate concentration increases, more substrate molecules bind to the enzyme, leading to increased enzymatic activity and an increase in the reaction velocity.
However, it is important to note that this relationship is only valid up to a certain point. At high substrate concentrations, all the enzyme's active sites become saturated with substrate molecules, and the reaction velocity reaches a maximum level or saturation point. Further increase in substrate concentration does not increase the reaction velocity beyond this point.