Cell would normally proceed to mitosis without interruption A Once it has entered the S phase B Once it has entered the G2 phase C At any time during cell division activity D None of the above
Correct option is A) The availability of mitogen and energy rich compounds decide whether G1 phase will be arrested (G0 phase) or undergo S- phase. This point is called check point or G1 cyclin or G1 point. Once the checkpoint of G1- phase is crossed and cell has entered S - phase, cell cycle will go on further division till completion. So, the correct answer is 'Once it has entered the S phase'.
