9. It has been well-studied that several hormones can promote prostate cancer cell growth: (I)Testosterone can enter the cells and then be converted to DHT, a specific ligand for androgenreceptor (AR); (2) Epidermal Growth Factor (EGF) will signal through EGF receptor (EGFR) topromote cancer cell proliferation. Please answer the following questions based on what you havelearned about signaling transduction. (8%)

