However, if we increase the concentration of the substrate the additional substrate can outcompete the inhibitor for the active side. Therefore, increasing the substrate concentration can remove the effect of that competitive inhibitor that it has on that enzyme. And this is only true in competitive inhibition. It is not true in uncompetitive and it is not true in non competitive. So if you're given a problem and you are told that by increasing the concentration you essentially remove that effect, you should know that that is competitive inhibition. Now, what's one example of a molecule that acts as an inhibitor in the competitive inhibition fashion?