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Biology · CELL CYCLE AND CELL DIVISION
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Biology · CELL CYCLE AND CELL DIVISION
During anaphase of mitosis, as daughter chromosomes migrate toward opposite poles, the orientation of their structural regions is such that:
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In oocytes of certain vertebrates, which sub-stage of Prophase I can last for months or even years?
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How does plant cytokinesis fundamentally differ from animal cytokinesis in terms of precursor structure and direction of wall/furrow formation?
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): During the S phase of the cell cycle, the amount of DNA per cell doubles from 2C to 4C, but the chromosome number remains unchanged (2n). Reason (R): DNA replication creates duplicate copies of the DNA molecules, which remain attached as sister chromatids at a single centromere. In the light of the above statements, choose the correct answer from the options given below:
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Consider the following statements concerning Prophase I of Meiosis: (A) Leptotene is marked by gradual visibility of chromosomes under the light microscope. (B) Synaptonemal complex dissolution occurs during diplotene, leaving X-shaped chiasmata. (C) Recombination nodules appear during zygotene where synapsis takes place. (D) Diakinesis is characterized by terminalisation of chiasmata and breakdown of nuclear envelope. Choose the correct answer from the options given below:
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How does Metaphase I of meiosis differ fundamentally from Metaphase II?
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In which stage does chromosome compaction continue throughout while they become gradually visible under the light microscope?
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Consider the following statements regarding Prophase I of Meiosis: (A) Chromosomes become gradually visible under the light microscope during leptotene. (B) Synapsis of homologous chromosomes results in the formation of a bivalent or tetrad in zygotene. (C) Crossing over is completed by the end of pachytene, leaving chromosomes linked at chiasmata. (D) Terminalisation of chiasmata marks the completion of diplotene. Which of the above statements are correct?
Read answer →Biology · CELL CYCLE AND CELL DIVISION
Which cellular structures disappear by the end of prophase and cannot be seen under the microscope when viewed at late prophase?
Read answer →Biology · CELL CYCLE AND CELL DIVISION
Refer to the diagrammatic representation of the eukaryotic cell cycle shown in the image. Which phase occupies more than 95% of the total duration of the cell cycle?
Read answer →Biology · CELL CYCLE AND CELL DIVISION
Simultaneous splitting of the centromere of each chromosome and movement of sister chromatids to opposite poles occurs during which stage of meiosis?
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Consider the following statements regarding the stages of mitosis: (A) At the end of prophase, cells do not show Golgi complexes, endoplasmic reticulum, nucleolus, and nuclear envelope when viewed under the microscope. (B) Centrosome duplication occurs during G2 phase of the cell cycle. (C) Metaphase is characterised by all chromosomes lying at the equator with their kinetochores connected by spindle fibres to both poles. (D) Centromeres divide during telophase to allow nuclear envelope reformation. Which of the above statements are correct?
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In a human cell culture having an average cell cycle duration of 24 hours, the duration spent by a dividing cell in interphase and M phase respectively is approximately:
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A diploid human cell cultured in vitro has an initial DNA content of 2C and 46 chromosomes in G₁ phase. What will be the DNA content and chromosome number respectively at G₂ phase?
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Match List-I with List-II: List-I (Phase/Stage) List-II (Key Event) A G₁ phase I Centriole duplicates in cytoplasm B S phase II Proteins synthesized for mitosis while cell growth continues C G₂ phase III Cell is metabolically active and continuously grows but does not replicate DNA D Quiescent stage (G₀) IV Cells remain metabolically active but no longer proliferate unless called upon Choose the correct answer from the options given below:
Read answer →Biology · CELL CYCLE AND CELL DIVISION
Which critical cytological difference distinguishes Anaphase I of meiosis from Anaphase II? Which of the above statements is/are correct?
Read answer →Biology · CELL CYCLE AND CELL DIVISION
Meiosis contributes significantly to evolution primarily because it:
Read answer →Biology · CELL CYCLE AND CELL DIVISION
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In animals, mitotic cell division is seen only in diploid somatic cells, with male honey bees being a notable exception. Reason (R): Plants never undergo mitotic cell division in haploid cells under any circumstances. In the light of the above statements, choose the correct answer from the options given below:
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The dissolution of the synaptonemal complex and the formation of X-shaped structures called chiasmata are diagnostic features of which sub-stage of Prophase I?
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Examine the stage of Meiosis I labelled as 'Anaphase I' in the provided figure. What is the fundamental behavior of chromosomes depicted at this stage?
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A key biological significance of mitosis in growing multicellular organisms is to restore which cellular balance?
Read answer →Biology · CELL CYCLE AND CELL DIVISION
Given below are two statements: Statement I: During G1 phase, the cell is metabolically active and continuously grows, but does not replicate its nuclear DNA. Statement II: In animal cells, during S phase, DNA replication begins in the nucleus while the centriole duplicates in the cytoplasm. In the light of the above statements, choose the most appropriate answer from the options given below:
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