CBSE Class 11 (Science) Cell Cycle and Cell Division — practice questions
86 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 (Science) Cell Cycle and Cell Division in the app →DNA replication during the cell cycle occurs inIn which phase of mitosis do chromosomes align at the cell's equator?Crossing over between homologous chromosomes occurs duringDNA replication in the cell cycle happens inAdult nerve cells and heart muscle cells most often sit in which phase?A typical human cell completes one full cycle in roughlyWhat happens to sister chromatids during anaphase?A diploid (2n=46) human cell undergoes mitosis. The two daughter cells each havePlant cell cytokinesis differs from animal cytokinesis because plant cellsLiquid endosperm in coconut water is multinucleate becauseAn adult human's skin cell has 2n=46 chromosomes. The chromosome number of its mitotic daughter isAcross the entire meiosis process, DNA is replicatedCrossing over between homologous chromosomes occurs in which sub-stage?Starting from one diploid (2n) parent cell, meiosis producesHuman cells in culture complete one cell cycle in about how much time?About how long can yeast take to pass through one full cell cycle?Which pair names the two basic phases into which the cell cycle is divided?In a typical eukaryotic cell cycle, interphase occupies what share of the total duration?In a human cell with a 24 hour cycle, roughly how long does cell division proper last?What is the division of the nucleus that separates daughter chromosomes called?In which phase of interphase does DNA replication occur?If the DNA amount in a cell at G1 is 2C, what does it become after the S phase?A diploid cell has 2n chromosomes at G1. How many does it have after the S phase?In animal cells, where and when does the centriole duplicate?Which phase has proteins being made in preparation for mitosis while the cell keeps growing?Cells that exit the cycle after G1 and stay inactive but alive are said to be in which stage?Which adult animal cells are given as an example of cells that do not appear to divide?What is true of cells in the G0 stage?Which animal is an exception whose haploid cells divide by mitosis?In which cells can plants show mitotic divisions?Why is mitosis also called equational division?Which of these is NOT one of the four stages of karyokinesis in mitosis?Prophase is marked by the initiation of which process?What are the microtubules radiating out from each centrosome in prophase called?The two asters together with the spindle fibres form which structure?At the end of prophase, which cell structures are no longer visible under the microscope?The complete disintegration of which structure marks the start of metaphase?At which stage of mitosis is chromosome morphology most easily studied?What are the small disc-shaped structures on the surface of centromeres called?What is the plane along which chromosomes align at metaphase called?Which key event characterises anaphase of mitosis?During anaphase, which part of each chromosome leads as it moves to the pole?Which event forms the two daughter nuclei in telophase?Which structures reform during telophase?How does cytokinesis occur in an animal cell?The formation of a new cell wall in plant cytokinesis begins with which precursor?The cell plate represents which layer between the walls of two adjacent cells?Cell growth disturbs which ratio, so that mitosis is needed to restore it?Mitosis usually yields daughter cells with what kind of genetic complement?Which contribution of mitosis is shown by constant replacement of gut lining and blood cells?What specialised cell division reduces the chromosome number by half?In sexually reproducing organisms, what restores the diploid phase after meiosis?Meiosis involves two sequential divisions but how many cycles of DNA replication?How many haploid cells are formed at the end of meiosis II?During which stage of prophase I do chromosomes become gradually visible?What is the pairing of homologous chromosomes in zygotene called?Synapsis is accompanied by formation of which complex structure?A pair of synapsed homologous chromosomes is called what?Recombination nodules, the sites of crossing over, appear at which stage?Which enzyme mediates crossing over?What is crossing over?Which event marks the beginning of diplotene?The X-shaped structures where homologues remain linked in diplotene are called what?In oocytes of some vertebrates, diplotene can last for how long?Terminalisation of chiasmata marks which stage of prophase I?By the end of diakinesis, what disappears?What aligns on the equatorial plate during metaphase I?What separates in anaphase I of meiosis?The two cells present after telophase I and cytokinesis are called what?What is the stage between the two meiotic divisions called?What happens to DNA during interkinesis?Meiosis II resembles which other process?What begins anaphase II?Telophase II ends with what outcome?How does meiosis help the process of evolution?Which two classes of regulators determine a cell's progress through the cell cycle?Which statement about cyclins and CDKs is correct?Which is one of the three main cell cycle checkpoints?The G1/S transition, a rate-limiting step, is also known by what name?The metaphase checkpoint ensures what before anaphase begins?Which protein helps trigger control mechanisms at the G1/S and G2/M checkpoints?Which cells often stay in G0 indefinitely?How do most bacteria and archaea reproduce?Abnormal separation of chromosomes during meiosis is known as what?Down syndrome results from which chromosomal change?Turner syndrome is caused by what chromosomal condition?