Cell Cycle & Cell Division PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions NEET Biology · Cell Cycle & Cell Division · Set 1 (Q1-30)
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1. $During which phase(s) of cell cycle, the amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C?$ (1) $G_{0} and G_{1}$ (2) $G_{1} and S$ (3) $Only G_{2}$ (4) $G_{2} and M$ 2. $Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres:$ (1) $Metaphase II$ (2) $Anaphase I$ (3) $Anaphase II$ (4) $Metaphase I$ 3. $In meiosis crossing over is initiated at:$ (1) $Pachytene$ (2) $Leptotene$ (3) $Zygotene$ (4) $Diplotene$ 4. $Anaphase Promoting Complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?$ (1) $Chromosomes will be fragmented$ (2) $Chromosomes will not segregate$ (3) $Recombination of chromosome arms will occur$ (4) $Chromosomes will not condense$ 5. $Which of the following is not characteristic feature during mitosis in somatic cells?$ (1) $Spindle fibres$ (2) $Disappearance of nucleolus$ (3) $Chromosome movement$ (4) $Synapsis$ 6. $Which stage of meiosis can last for months or years in the oocytes of some verterbrates?$ (1) $Leptotene$ (2) $Pachytene$ (3) $Diplotene$ (4) $Diakinesis$ 7. $In a mitotic cycle, the correct sequence of phases is$ (1) $S, G_{1}, G_{2}, M$ (2) $G_{1}, S, G_{2}, M$ (3) $M, G_{1}, G_{2}, S$ (4) $G_{1}, G_{2}, S, M$ 8. $During mitosis ER and nucleolus begin to disappear at :$ (1) $Early prophase$ (2) $Late prophase$ (3) $Early metaphase$ (4) $Late metaphase$ 9. $Among eukaryotes, replication of DNA takes place in$ (1) $G_{2} phase$ (2) $M phase$ (3) $S phase$ (4) $G_{1} phase$ 10. $An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called$ (1) $Thylakoid$ (2) $Endoplasmic reticulum$ (3) $Plasmalemma$ (4) $Cytoskeleton$ 11. $Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?$ (1) $Zygotene$ (2) $Diakinesis$ (3) $Pachytene$ (4) $Leptotene$ 12. $The enzyme recombinase is required at which stage of meiosis:$ (1) $Pachytene$ (2) $Zygotene$ (3) $Diplotene$ (4) $Diakinesis$ 13. $Regarding Meiosis, which of the statements is incorrect?$ (1) $Four haploid cells are formed at the end of Meiosis-II$ (2) $There are two stages in Meiosis, Meiosis-I and II$ (3) $DNA replication occurs in S phase of Meiosis-II$ (4) $Pairing of homologous chromosomes and recombination occurs in Meiosis-I$ 14. $During gamete formation the enzyme recombinase participates during$ (1) $Metaphase I$ (2) $Anaphase II$ (3) $Prophase I$ (4) $Prophase II$ 15. $Which of the following stages of meiosis involves division of centromere?$ (1) $Telophase$ (2) $Metaphase I$ (3) $Metaphase II$ (4) $Anaphase II$ 16. $Attachment of spindle fibers to kinetochores of chromosomes becomes evident in$ (1) $Telophase$ (2) $Prophase$ (3) $Metaphase$ (4) $Anaphase$ 17. $Identify the correct statement with regard to G_{1} phase (Gap1) of interphase.$ (1) $Nuclear Division takes place.$ (2) $DNA synthesis or replication takes place.$ (3) $Reorganisation of all cell components takes place.$ (4) $Cell is metabolically active, grows but does not replicate its DNA.$ 18. $Which one of the following never occurs during mitotic cell division?$ (1) $Coiling and condensation of the chromatids$ (2) $Spindle fibres attach to kinetochores of chromosomes$ (3) $Movement of centrioles towards opposite poles$ (4) $Pairing of homologous chromosomes$ 19. $A somatic cell that has just completed the S phase of its cell cycle when compared to the gamete of the same species has$ (1) $Twice the number of chromosomes and twice the amount of DNA.$ (2) $Same number of chromosomes but twice the amount of DNA.$ (3) $Twice the number of chromosomes and four times the amount of DNA.$ (4) $Four times the number of chromosomes and twice the amount of DNA.$ 20. $Select the incorrect statement with reference to mitosis:$ (1) $Splitting of centromere occurs at anaphase$ (2) $All the chromosomes lie at the equator at metaphase$ (3) $Spindle fibres attach to centromere of chromosomes$ (4) $Chromosomes decondense at telophase$ 21. $Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G_{0}) . This process occurs at the end of$ (1) $G_{1} -phase$ (2) $S-phase$ (3) $G_{2} -phase$ (4) $M-phase$ 22. $Dissolution of the synaptonemal complex occurs during$ (1) $Zygotene$ (2) $Diplotene$ (3) $Leptotene$ (4) $Pachytene$ 23. $The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?$ (1) $Diakinesis$ (2) $Pachytene$ (3) $Zygotene$ (4) $Diplotenes$ 24. $Which is incorrect statement about meiosis?$ (1) $Meiosis involves two sequential cycles of nuclear and cell division called meiosis I and meiosis II but only a single cycle of DNA replication.$ (2) $Meiosis I is initiated after parental chromosome have replicated to produce sister chromatids at the S phase.$ (3) $Meiosis involves pairing of nonhomologous chromosomes and recombination between them.$ (4) $Four haploid cells are formed at the end of meiosis-II.$ 25. $During Meiosis-I, in which stage synapsis takes place?$ (1) $Pachytene$ (2) $Zygotene$ (3) $Diplotene$ (4) $Leptotene$ 26. $The synaptonemal complex formed by a pair of synapsed homologous chromosomes is called$ (1) $Bivalent$ (2) $Tetravalent$ (3) $Tetrad$ (4) $Both (a) and (c)$ 27. $Which of the following options gives the correct sequence of events during mitosis ?$ (1) $Condensation \to nuclear membrane disassembly \to arrangement at equator \to centromere division \to segregation \to telophase$ (2) $Condensation \to crossing over \to nuclear membrane disassembly \to segregation \to telophase$ (3) $Condensation \to arrangement at equator \to centromere division \to segregation \to telophase$ (4) $Condensation \to nuclear membrane disassembly \to crossing over \to segregation \to telophase$ 28. $The complex formed by a pair of synapsed homologous chromosomes is called$ (1) $Equatorial plate$ (2) $Kinetochore$ (3) $Bivalent$ (4) $Axoneme$ 29. $During mitosis the ER and nucleolus begins to disappear at$ (1) $Late prophase$ (2) $Early metaphase$ (3) $Late metaphase$ (4) $Early prophase$ 30. $The centriole undergoes duplication during$ (1) $Prophase$ (2) $Metaphase$ (3) $G_{2} -phase$ (4) $S-phase$