The G1 checkpoint is a critical control mechanism that ensures the cell is ready for DNA synthesis. At this point, the cell checks for: - DNA Damage: The cell examines its DNA for any damage. If damage is detected, the cell can either repair it or, if irreparable, undergo [apoptosis](#). - Nutritional Status: The cell ensures that it has sufficient nutrients and energy to support the next phases of the cell cycle. - Cell Size: The cell checks if it has grown to the appropriate size to support DNA replication and division.
