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Cell Cycle Checkpoints

APBIO-TEMPFE

Cell Cycle: From Wikimedia Commons, by Zephyris [(http://en.wikipedia.org/wiki/User:Zephyris)]

The schematic above shows a typical cell cycle progression. The star marks the position of a vital stage in cell cycle control.

Which of the following is the MOST important role of this checkpoint?

A

To ensure that the cycle does not proceed before the cell goes through $G_0$.

B

To ensure that the cycle does not proceed before sister chromatids are attached to kinetochore microtubules.

C

To ensure that the cycle does not proceed before incorrectly synthesized DNA is repaired.

D

To ensure that the cycle does not proceed before sufficient growth and nutrients are attained.