Which of the following statements regarding the G1 (first gap) phase of the eukaryotic cell cycle is NOT true?
A. Most cells spend the majority of their lives in the G1 phase of the cell cycle.
B. Cells that are terminally differentiated and will not divide mitotically might exit the G1 phase and enter the G0 phase.
C. If environmental conditions are favorable during the G1 phase, G1 cyclins are degraded causing the cell to prepare to replicate its DNA.
D. The G1 phase is only part of interphase.
E. If DNA is heavily damaged, checkpoint proteins will delay the cell cycle; the damage will either be fixed or cell division will be permanently stopped.
C. If environmental conditions are favorable during the G1 phase, G1 cyclins are degraded causing the cell to prepare to replicate its DNA.
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