Answer: Uncontrolled cell division (mitosis).
- A Controlled and well-regulated cell division
- B Programmed cell death pathways activating
- C Uncontrolled cell division (mitosis)
- D Errors occurring only during meiosis
Correct answer: C. Uncontrolled cell division (mitosis)
Explanation: Cancer results from loss of cell cycle control: cells divide uncontrollably, forming tumors.
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.