Question

question 10 proto-oncogenes encode proteins that stimulate cell division. stops the cell from leaving its g1 phase. suppress tumors. restrict cell division.

Explanation:

Proto - oncogenes are normal genes that can become oncogenes (genes that promote cancer) when mutated. They encode proteins that stimulate cell division. Tumor suppressor genes, on the other hand, restrict cell division and suppress tumors. The option "stops the cell from leaving its G1 phase" is more related to cell cycle check - point mechanisms which can be regulated by tumor suppressor - like proteins in some cases, but not the function of proto - oncogenes.

Answer:

stimulate cell division.