Answer: Plasma membrane fusion and cutting at the midbody region (ESCRT machinery).
- A Inward movement and ingression of the actomyosin cleavage furrow itself
- B Plasma membrane fusion and cutting at the midbody region (ESCRT machinery)
- C Complete disassembly of the entire mitotic spindle apparatus structure
- D Reformation of the nuclear envelope around the segregated chromosomes
Correct answer: B. Plasma membrane fusion and cutting at the midbody region (ESCRT machinery)
Explanation: Abscission: the final cut of cytoplasm connecting two daughter cells. ESCRT-III machinery at the midbody constricts and cuts the narrow cytoplasmic bridge.
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.