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Biology · CELL CYCLE AND CELL DIVISION
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Biology · CELL CYCLE AND CELL DIVISION
Which of the following physiological states accurately describes cells entering the quiescent stage (G0) of the cell cycle?
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The morphology of chromosomes is most easily studied at which phase of cell division due to maximum condensation?
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Match List-I with List-II: List-I (Meiotic Stage) List-II (Characteristic Event) A Zygotene I Enzyme-mediated crossing over involving recombinase B Pachytene II Formation of synaptonemal complex and pairing of homologous chromosomes C Diplotene III Terminalisation of chiasmata and full condensation of meiotic chromosomes D Diakinesis IV Dissolution of synaptonemal complex and appearance of X-shaped chiasmata Choose the correct answer from the options given below:
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During pachytene stage of meiosis I, the enzyme recombinase mediates exchange of genetic material specifically between:
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The complex structure formed by a pair of synapsed homologous chromosomes during zygotene is called:
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Which of the following biological processes specifically necessitates mitotic cell division to restore the nucleo-cytoplasmic ratio in growing organisms?
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During anaphase of mitosis, how do the splitting chromosomes orient themselves while moving toward opposite poles?
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If an onion root tip cell possesses 16 chromosomes in G₁ phase, how many chromosomes and how many chromatids will be present in this cell during Metaphase of mitosis?
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Consider the following statements regarding Meiosis II: (A) Meiosis II is initiated immediately after cytokinesis, usually before chromosomes have fully elongated. (B) Meiosis II resembles a normal equational mitotic division. (C) Anaphase II begins with the separation of homologous chromosome pairs without centromere splitting. (D) Telophase II concludes with the formation of a tetrad of cells comprising four haploid daughter cells. How many of the above statements are correct?
Read answer →Biology · CELL CYCLE AND CELL DIVISION
At which mitotic stage does the complete disappearance of the nuclear envelope occur, and what is the specific site for spindle fibre attachment on the chromosomes?
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Given below are two statements: Statement I: In plant cells, cytokinesis begins by a furrow in the plasma membrane that deepens centripetally to divide the cell. Statement II: The cell plate formed during plant cytokinesis represents the primary cell wall directly. In the light of the above statements, choose the most appropriate answer from the options given below:
Read answer →Biology · CELL CYCLE AND CELL DIVISION
Consider the following statements regarding cytokinesis and cell division mechanisms: (A) In animal cells, cytokinesis involves the formation of a furrow that deepens centripetally. (B) In plant cells, wall formation proceeds centrifugally from the centre outward. (C) The cell-plate formed in plant cytokinesis represents the future primary cell wall. (D) Failure of cytokinesis following karyokinesis results in a multinucleate syncytium as seen in liquid endosperm of coconut. How many of the above statements are correct?
Read answer →Biology · CELL CYCLE AND CELL DIVISION
Consider the following statements regarding the eukaryotic cell cycle: (A) In G₁ phase, the cell is metabolically active and continuously grows without DNA replication. (B) In S phase, DNA content per cell doubles, but the chromosome number remains unchanged. (C) Centriole duplication in animal cells occurs in the nucleus during G₂ phase. (D) In adult animals, heart cells do not appear to exhibit division and exist in quiescent stage (G₀). Which of the above statements are correct?
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Match List-I with List-II: List-I (Mitotic Stage) List-II (Defining Feature) A Prophase I Chromosomes align at equator and spindle fibres attach to kinetochores B Metaphase II Centromeres split simultaneously and chromatids move to opposite poles C Anaphase III Nuclear envelope develops around chromosome clusters forming daughter nuclei D Telophase IV Initiation of condensation of chromosomal material and centrosomes move to opposite poles Choose the correct answer from the options given below:
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In which social insect is mitotic division naturally seen in haploid individuals as an exception to the general occurrence in diploid cells?
Read answer →Biology · CELL CYCLE AND CELL DIVISION
A cell examined at G1 phase of the cell cycle contains 16 chromosomes and has a DNA content of 2C. What will be the number of chromosomes and the DNA content respectively in the same cell at G2 phase and after the completion of anaphase of mitosis?
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Crossing over between non-sister chromatids of homologous chromosomes is an enzyme-mediated process. Which enzyme is directly involved?
Read answer →Biology · CELL CYCLE AND CELL DIVISION
During mitotic prophase in an animal cell, the mitotic apparatus is formed by:
Read answer →Biology · CELL CYCLE AND CELL DIVISION
