Respuesta :
For the problem presented, the answer that would justify this statement is Apo-repressor can only bind to the operator site of trp operon when a tryptophan molecule, which is a co-repressor, binds to it. The correct answer between all the choices given is the first choice or letter A. I am hoping that this answer has satisfied your query about this specific question.
"Apo-repressor can only bind to the operator site of trp operon when a tryptophan molecule, which is a co-repressor, binds to it" is the statement that justifies the statement given in the question. The correct option among all the options that are given in the question is the first option or option "A". I hope the answer comes to your help.