The root cause of cancer cell formation is________
A. Stimulation by physical carcinogens
B. Stimulation by chemical carcinogens
C. Stimulation of viral carcinogens
D. Activation of intracellular proto-oncogenes
Answer:D
The root cause of cancer cell formation is________
A. Stimulation by physical carcinogens B. Stimulation by chemical carcinogens C. Stimulation of viral carcinogens D. Activation of intracellular proto-oncogenes