NEET UG · Biology

Cell Cycle and Cell Division

27 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 27 questions

  1. During which phase of the eukaryotic cell cycle does DNA replication occur, doubling the DNA content from to while keeping the chromosome number constant ()?
  2. In which substage of meiotic Prophase I does crossing over (genetic recombination) occur between non-sister chromatids of homologous chromosomes?
  3. The X-shaped structures formed at the sites of crossing over between homologous chromosomes become clearly visible during which stage of Prophase I?
  4. What occurs during Anaphase I of meiosis that fundamentally differs from mitotic Anaphase?
  5. During which mitotic phase do chromosomes align along the equatorial plane of the spindle, making it the most suitable stage to study chromosome morphology and karyotyping?
  6. In animal cells, the division of cytoplasm (cytokinesis) is accomplished by:
  7. What is the quiescent stage () of the eukaryotic cell cycle?
  8. The synaptonemal complex, a tripartite proteinaceous structure that stabilizes paired homologous chromosomes, assembles during which substage of Prophase I?
  9. During the eukaryotic cell cycle, when does centrosome duplication occur in animal cells?
  10. Which chemical agent acts as a mitotic spindle poison by binding to tubulin dimers, preventing microtubule assembly and arresting cells at metaphase?
  11. If a diploid human cell contains 46 chromosomes () with a DNA content of in phase, what are the chromosome number and DNA content in phase?
  12. What is the terminal stage of meiotic Prophase I, characterized by complete terminalization of chiasmata and breakdown of the nuclear envelope?
  13. Which multi-protein complex mediates the attachment of spindle microtubules to the centromeric region of chromosomes?
  14. Liquid endosperm in coconut is formed because of which cellular phenomenon?
  15. The short transition stage occurring between Meiosis I and Meiosis II is called:
  16. How many mitotic cell divisions are required to produce 128 cells from a single diploid parent cell?
  17. In anaphase of mitosis, sister chromatids separate and move toward opposite spindle poles with their:
  18. Which enzyme complex is responsible for catalyzing crossing over during the pachytene stage of meiosis?
  19. During which phase of mitosis do the nuclear envelope, nucleolus, and endoplasmic reticulum reform around the daughter nuclei?
  20. A cell with chromosomes undergoes meiosis. How many bivalents and how many total chromatids are present in a cell at Metaphase I?
  21. Which checkpoint in the eukaryotic cell cycle ensures that all chromosomes are properly bi-oriented and attached to the mitotic spindle before triggering anaphase onset?
  22. In human females, oocytes initiate meiosis during embryonic life and remain arrested at which stage until ovulation occurs at sexual maturity?
  23. What is the structure in plant cells that serves as the precursor for the developing cell plate during cytokinesis?
  24. Which of the following events characterizes the Zygotene stage of Meiosis I?
  25. At the onset of mitotic Anaphase, which key molecular event triggers the synchronous separation of sister chromatids?
  26. Why is Meiosis II referred to as an equational division?
  27. If a root apical meristem cell has 16 chromosomes in phase, how many chromosomes and how many chromatids will be present in this cell during Metaphase of mitosis?

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