The tryptophan will not bind to this protein. It will not activate it and so nothing will bind to the operator section and nothing will block the transcription of these genes. And what that means is the RNA polymerase will easily bind onto the promoter section, the blue section. It will move along these five structural genes. It will produce the mRNA and then the mRNA will be used by the ribosomes to produce the enzymes and then the enzymes will be used to produce the tryptophan amino acid. So this is usually what is happening within the cell because the cell is usually continually producing the tryptophan that is needed to produce the many different proteins and enzymes that are found within the cell.