A Proto-Oncogene ____

Question

A proto-oncogene ____.
A) always becomes cancerous
B) causes cancer
C) encodes tumor-suppressing proteins
D) repairs DNA
E) regulates cell division

Accepted Answer

Proto-oncogenes are genes that regulate normal cell division and growth. They can become oncogenes when they are mutated or abnormally expressed, leading to uncontrolled cell division and potentially resulting in cancer. Therefore, the correct choice is E, as proto-oncogenes play a crucial role in regulating cell division.