Which statement about proto-oncogenes is false?
A) Proto-oncogenes are normal genes with the potential to become oncogenes.
B) Many proto-oncogenes code for growth factors.
C) A mutation must occur in a cell's DNA for a proto-oncogene to become an oncogene.
D) If a proto-oncogene's gene product is produced in smaller quantities, a cell may become cancerous.
Answer: D
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