How does a cell typically know when to divide?
A)Cells have an internal clock and divide only when they reach a certain age.
B)Tumor suppressor genes code for growth factor proteins that initiate cell division.
C)Proto-oncogenes code for growth factor proteins that initiate cell division.
D)Oncogenes code for growth factor proteins that initiate cell division.

Question

Quizplus · Accepted Answer

Proto-oncogenes are a type of genes that normally promote cell growth and division. They code for proteins such as growth factors, which stimulate signals within the cell that promote cell division. When the cell is ready to divide, proto-oncogenes are activated and initiate cell division. However, mutations in proto-oncogenes can lead to the formation of oncogenes, which can cause uncontrolled cell division and lead to cancer. Therefore, the activation of proto-oncogenes is critical for normal cell division and growth.

How Does a Cell Typically Know When to Divide