Proto-Oncogenes Can Change into Oncogenes That Cause Cancer

question 63

Multiple Choice

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 normally help regulate cell division.
• C) Proto-oncogenes are genetic "junk."
• D) Proto-oncogenes are mutant versions of normal genes.
• E) Cells produce proto-oncogenes as they age.

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