And so what that basically means is inside our cells, the efficiency, or I should say not the efficiency, but the rate, the velocity of that enzyme is usually much lower than its maximum velocity. So for example, if the concentration is somewhere here, then the corresponding rate will be somewhere here, much smaller than that maximum velocity. Now, what we want to basically explore in this lecture is how to actually measure the catalytic efficiency of the enzyme inside our cell. So we want to come up with an equation, a rate law that describes how the rate of a particular enzyme catalyzed reaction is affected by different types of variables. This is what we basically want to explore. So as always, let's begin with the same equation that we use to derive the Maclus methane equation.