You are studying a set of mouse genes whose expression increases when cells are exposed to the steroid hormone cortisol, and you believe that the same cortisol-responsive receptor protein regulates all of these genes. Which of the following statements below should be true if your hypothesis is correct?
Choose one:
A. The cortisol-responsive genes share a DNA sequence in their regulatory regions that binds the cortisolbound receptor protein.
B. The cortisol-responsive genes must all be in an operon.
C. Only the receptor protein, and no other transcriptional regulators, are required.
D. All of the above