Now what exactly is this process of proteolysis? Well, sometimes our cell produce enzymes initially in their inactive form and these inactive enzymes, precursor enzymes, are known as proenzymes or zymogens. And we'll see many different examples in just a moment. Now to actually activate these enzymes we have to basically cleave the enzymes as specific peptide bonds. So sometimes we cleave one peptide bond, sometimes we cleave many peptide bonds, but the end result is the same exact when our enzymeogen undergoes proteolytic activation, proteolytic cleavage, by some type of protease we basically produce the fully functional form of that enzyme. Now when we discussed the process of phosphorylation we said that only those enzymes and proteins that are found inside our cells can actually be controlled via the process of phosphorylation.