And now the active form of this repressor protein will go on and bind onto the operator section, the green section of the opera and once down that will basically inhibit that will block RNA polymerase from actually transcribing these five genes. And so in this case when we have a high concentration of tryptophan inside the cell we're not going to produce any mRNA molecules and so we will not synthesize these enzymes and will not synthesize the tryptophan. And that makes sense because if inside the cells we have a lot of tryptophan that bacterial cell wants to conserve as much energy as possible. And so there's no need to form the tryptophan because the cell already has a high amount of tryptophan inside. But if the tryptophan concentration is low as the case is in part A, then what happens is we need to form more tryptophan so that the cell can function properly and effectively, so that the cell can form the many different proteins and enzymes that require this tryptophan amino acid. And so what will happen is our operon will be turned on because this inactive repressive protein will remain in its inactive form.