Proto-oncogenes can change into oncogenes that cause cancer.Which of the following best explains the presence of thesepotential 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 help regulate cell division.

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Q: 23

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