- A Completion of DNA replication during S phase
- B Correct attachment of all chromosomes to spindle fibers
- C Reformation of the nuclear envelope after mitosis
- D Completion of cytokinesis and cell separation
Correct answer: B. Correct attachment of all chromosomes to spindle fibers
Explanation: Spindle assembly checkpoint: holds the cell at metaphase until ALL chromosomes are properly attached to spindle at kinetochores.
Concept context
Mitosis and meiosis: how cells divide for growth, repair, and reproduction.