Then enzyme two takes B, transforms it into intermediate C and enzyme three then takes C and transforms it into our product D. Now, in this process of feedback mechanism, we basically have one of these intermediates or products moves back and binds to the allosteric sites of one of these enzymes. And that either inhibits or activates the activity of that enzyme. And depending on whether we have inhibition or activation, we have these two types of feedback mechanism processes. We have negative feedback inhibition and positive feedback which is basically our activating process. So let's begin with the negative feedback inhibition. So if the effector molecule binds to the allosteric site of the enzyme and inhibits its activity, this effector molecule is known as the inhibitor.