And when an enzyme is added into the mixture, the enzyme will increase K. It will not affect the concentration of A. And so to increase V the rate of that reaction, the enzyme must increase the value of K. Now what exactly is the order of the reaction? So earlier we said that the order of this reaction was one and the order of this reaction was also one. And the same thing was true for this particular case. So we see that the order of the reaction basically describes the rate of the reaction and how it actually depends on the concentration of those reactants. So let's begin with the first order reaction that we basically described in this lecture.