Answer: DNA is replicated without errors before mitosis.
- A DNA is replicated without errors before mitosis
- B Cells have accumulated enough stored nutrients
- C The mitotic spindle apparatus is largely assembled
- D Cytokinesis has been completed successfully
Correct answer: A. DNA is replicated without errors before mitosis
Explanation: G<sub>2</sub> checkpoint: verifies DNA replication is complete and error-free before entering mitosis. Damaged DNA triggers arrest.
The cell cycle: G1 (growth and preparation), S (DNA replication, chromosome number stays 2n but DNA content doubles), G2 (final checks before division), and M (mitosis itself) - together, G1+S+G2 make up interphase.
Concept context
Mitosis and meiosis: how cells divide for growth, repair, and reproduction.