Essential Biochemistry - Cancer (Section 1 - No. 9)
Which of the following statements regarding proto-oncogenes are true, except:
They are present in normal cells
They are present only in cancer cells
They code for growth factors, receptors and other proteins involved in cell proliferation
When they get mutated, they become oncogenes
Explication
Proto-oncogenes are normal genes found in normal cells. The exception is that they are not only present in cancer cells.