Which of the following statements about the cell cycle is FALSE? Once a cell decides to enter the cell cycle, the time from start to finish is the same in for all eukaryotic cell types. An unfavorable external environment can cause cells to arrest in G1. The p53 check point pathway can be activated in G1, Sor G2 phases of the cell cycle O Mitogens stimulate cell division by releasing the molecular brakes that keep cells in the GO or G1 phase of the cell cycle