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The G1 checkpoint chiefly assesses whether

  • A.DNA replication has been completed without error
  • B.the two daughter cells have fully separated apart
  • C.the cell is large enough and the DNA undamaged
  • D.every chromosome is properly attached to the spindle

Answer: C

Size, nutrients, growth signals and DNA integrity are all weighed before the cell commits. The other options describe what is tested at the G2 and spindle checkpoints instead. Each checkpoint asks a different question at a different moment.

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