The eukaryotic cell cycle is regulated by various checkpoints to ensure that cell division occurs without errors.
Which of the following statements about these checkpoints is correct?
The spindle (M) checkpoint occurs during anaphase to verify that sister chromatids have successfully separated.
If a cell does not receive a go-ahead signal at the G1G_1G1 checkpoint, it may exit the active cycle and enter a non-dividing state called the G0G_0G0 phase.
The G2G_2G2 checkpoint is responsible for checking if the cell is large enough and has sufficient resources to begin DNA replication.
If an irreparable error is detected at the G2G_2G2 checkpoint, the cell cycle runs in reverse to the SSS phase to replicate the DNA again.
40 exam-style questions on OCR A A Level Biology Cell division, cell diversity and cellular organisation. Each one has a worked solution and a mark scheme showing where the marks go.