A Levels Biology (9700)•9700/13/O/N/19
Explanation
Cell Division Processes in the Diagram
Steps:
- Examine the diagram for pre-mitotic stages indicating DNA duplication, which represents replication.
- Identify the separation of duplicated chromosomes into two nuclei, showing nuclear division (mitosis).
- Observe the division of the cell's cytoplasm and organelles, indicating cytokinesis.
- Combine these to match the full sequence of cell reproduction.
Why B is correct:
- Cell division requires DNA replication (S phase of interphase) to duplicate genetic material, nuclear division (mitosis) to distribute it, and cytokinesis to split the cytoplasm, as defined in the cell cycle.
Why the others are wrong:
- A omits cytokinesis, which physically separates daughter cells.
- C ignores DNA replication and cytokinesis, limiting to nuclear events only.
- D excludes DNA replication, starting from mitosis without genetic preparation.
Final answer: B
Topic: Replication and division of nuclei and cells
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