So in order to actually study the behavior of enzymes and how they catalyze reactions, we have to study the rates of these enzymes and the rates at which they catalyze the reactions. Now, one way in enzyme kinetics that we study the rates of reactions is by plot the following curve. Now on the curve, the y axis is the reaction velocity v knot of that particular enzyme. And that's basically the rate at which the enzyme catalyzes its particular substrate. And the x axis is the concentration of the substrate S that binds onto the active side of the enzyme. So what we essentially do is we carry out an experiment.