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Multiple Choice
Which of the following cell cycle checkpoints ensures that the genetic material is fully replicated before mitosis?
A
G0.
B
M.
C
G1.
D
G2.
E
S.
Verified step by step guidance
1
Understand the cell cycle phases: The cell cycle consists of interphase (G1, S, G2) and mitosis (M phase). Each phase has specific roles in cell growth and division.
Identify the role of each phase: G1 is the first gap phase where the cell grows, S phase is where DNA replication occurs, G2 is the second gap phase where the cell prepares for mitosis, and M phase is where mitosis and cytokinesis occur.
Recognize the purpose of checkpoints: Checkpoints are control mechanisms in the cell cycle that ensure each phase is completed accurately before moving to the next phase.
Focus on the G2 checkpoint: The G2 checkpoint is crucial because it ensures that all the DNA has been replicated correctly and is undamaged before the cell enters mitosis.
Conclude that the G2 checkpoint is responsible for verifying the completion of DNA replication, making it the correct answer to the question.