It will not bind to the tryptophan because we will not have enough tryptophan inside that cell. So this is what we mean by a repressible operon. So a repressible operon is the most common type of opera that is used by bacterial cells when it comes to anabolic processes, processes in which we have to synthesize some type of important molecule. In the case of the tryptophan opera, it's the tryptophan amino acid that we have to synthesize. Now, for a repressible operon, usually this is what we have case A. So usually the repressible opera is turned on because we need to continually synthesize that biomolecule, in this case, the tryptophan amino acid.