So remember, every single alpha amino acid contains a central carbon that is bound onto a carboxyl group and onto an amino group. Now, let's take a look at the following table and discuss what it actually tells us. So, the first column basically describes that particular ionizable group or that particular ionizable amino acid. Now, the middle column describes that acid based reaction that takes place. On the left side, we have the acid. On the right side, we have the conjugate base that is formed when an H plus ion is actually lost.