You are studying a set of mouse genes whose expression increases when cells are exposed to the hormone cortisol, and you believe that the same cortisol-responsive transcriptional activator regulates all of these genes. which of the following statements believe should be true if your hypothesis is correct? a. the cortisol-responsive genes share a dna sequence in their regulatory regions that binds the cortisol-responsive transcriptional activator. b. the cortisol-responsive genes must all be in an operon. c. the transcriptional regulators that bind to the regulatory regions of the cortisol-responsive genes must all be the same. d. the cortisol-responsive genes must not be transcribed in response to other hormones.