And we'll discuss that in much more detail eventually. So we see that these enzymes are very, very good at transforming one form of energy that we can't use into a form that we can use, and that is what enzymes do. Number three enzymes typically do not act alone, and they require additional molecules. And these molecules are known as Cofactors. So Cofactors are helping molecules that are needed for the enzymes to actually function effectively and efficiently. So when an enzyme is not bound to its Cofactor, we call the enzyme apoenzyme.