And in fact, enzyme kinetics is the study of the rates of these enzyme catalyzed reactions that take place inside our body. Now, in the next lecture we're going to begin our study of enzyme kinetics. But in this lecture we're going to remember some basic information about how to actually represent and express the rates of chemical reactions. We're going to remember what the rate law is and what the rate constant is and how enzymes affect these two quantities. And we're also going to remember what the order of reaction is. So let's begin with the following hypothetical chemical reaction.