All your cells contain proto-oncogenes, which can change into cancer-causing genes. why do cells possess such potential time bombs?
a. cells produce proto-oncogenes as a by-product of mitosis.
b. proto-oncogenes are necessary for the normal control of cell growth and division.
c. proto-oncogenes protect cells from infection by cancer-causing viruses.
d. proto-oncogenes are unavoidable environmental carcinogens.
e. proto-oncogenes are genetic junk that has not yet been eliminated by natural selection.
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