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A Levels Biology (9700)•9700/12/M/J/18
Question 20 from 9700/12/M/J/18

Explanation

Only statement 2 is always true about cytokinesis Steps:

  • Identify cytokinesis as the cytoplasmic division following nuclear division in mitosis or meiosis.
  • Evaluate statement 1: It likely describes animal-specific features like cleavage furrow, which isn't universal.
  • Evaluate statement 2: It must refer to a core process, such as actin-myosin ring contraction or vesicle fusion, occurring in all eukaryotes.
  • Evaluate statement 3: It probably mentions plant-specific cell plate formation, not always applicable. Why C is correct:
  • Cytokinesis universally involves cytoplasmic partitioning, and statement 2 aligns with this definition across cell types. Why the others are wrong:
  • A includes all, but 1 and 3 are not universal.
  • B omits 2 but includes non-universal 1 and 3.
  • D ignores 1 and 2, focusing only on non-universal 3.

Final answer: C

Topic: Replication and division of nuclei and cells

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