Which genes encode proteins that regulate the cell cycle in normal cells?
A) tumor suppressor genes
B) proto-oncogenes
C) oncogenes
D) tumor suppressor genes and proto-oncogenes
E) tumor suppressor genes, proto-oncogenes, and oncogenes

Question

Quizplus · Accepted Answer

Tumor suppressor genes and proto-oncogenes play crucial roles in regulating the cell cycle in normal cells. Tumor suppressor genes help control cell growth and division, preventing uncontrolled cell proliferation. Proto-oncogenes, when functioning normally, also help regulate cell growth and division. When proto-oncogenes are mutated, they can become oncogenes, contributing to cancer development by promoting uncontrolled cell division. Oncogenes themselves are not involved in the normal regulation of the cell cycle but are mutated forms of proto-oncogenes that contribute to cancer. Therefore, the correct answer includes both tumor suppressor genes and proto-oncogenes, which are involved in the normal regulation of the cell cycle.

Which Genes Encode Proteins That Regulate the Cell Cycle in Normal