Many Cells in Your Body Stop at the G1 Checkpoint

Multiple Choice

Many cells in your body stop at the G1 checkpoint and never divide again.Some cells,like skin cells,will continue past the G1 checkpoint.What types of genes tell a skin cell to move on past the G1 checkpoint?

A) proto-oncogenes
B) tumor-suppressor genes
C) cell-enhancing genes
D) oncogenes
E) tumor-deflecting genes