Proto-oncogenes can change into oncogenes that cause cancer. which of the following best explains the presence of these potential time bombs in eukaryotic cells?
a. proto-oncogenes first arose from viral infections.
b. proto-oncogenes are mutant versions of normal genes.
c. proto-oncogenes are genetic "junk."
d. proto-oncogenes normally regulate cell division.

The correct answer is D.

Explanation:

Proto-oncogenes code for proteins that usually help to regulate cell growth and differentiation.

If they acquire a mutation, they become oncogenes and therefore can induce cancer.

Additionally, if they increase the amount of certain proteins concentration or acquire chromosomal translocations they can also become oncogenes.

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