The success of DNA replication is assessed at the checkpoin

The success of DNA replication is assessed at the ___ checkpoint M G_2 G_1 C What cell cycle checkpoint regulates entry into the S phase of the cell cycle? M G_0 G_2 G_1

Solution

1. The success of DNA replication is assessed at the G2 checkpoint.

2. G1 checkpoint regulates entry into the S phase of the cell cycle.

The resting phase of the cell division is divided into two growth phases, G1 and G2 and a synthesis phase, S phase. These are arranged in G1, S and G2 phase. After the completion of the G2 phase, the cell enters the M phase or mitosis. But prior to mitosis, the cell undergoes many regulatory checkpoints to ensure the cell size, the number of replicated chromosomes and other factors are suitable or not.

At the G1 checkpoint, it is checked whether the cell growth is optimum and whether factors responsible for carrying out DNA replication and protein synthesis is present or not. Then only the cell can enter the S phase.

At the G2 checkpoint, it is checked whether the DNA has replicated correctly or not, then only the cell can undergo mitosis.