Answer: Chromosome segregation error correction at kinetochores.
- A Initiating new rounds of DNA replication at origins
- B Chromosome segregation error correction at kinetochores
- C Assembling the bipolar mitotic spindle apparatus
- D Triggering breakdown of the nuclear envelope
Correct answer: B. Chromosome segregation error correction at kinetochores
Explanation: Aurora B kinase is part of the chromosomal passenger complex (CPC). It corrects erroneous kinetochore-microtubule attachments (e.g., merotelic) to prevent mis-segregation.
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.