Cell Cycle and Cell Division

Cell Cycle and Cell Division

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Advanced Botany

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  1. During the metaphase stage of mitosis spindle fibres attach to chromosomes at








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    Kinetochores are small disc-shaped structures at the surface of the centromeres which serve as the sites of attachment of spindle fibres to the chromosomes that are moved into position at the centre of the cell. Hence, the metaphase is characterised by all the chromosomes that proceed to lie at the equator.

    Correct Option: B

    Kinetochores are small disc-shaped structures at the surface of the centromeres which serve as the sites of attachment of spindle fibres to the chromosomes that are moved into position at the centre of the cell. Hence, the metaphase is characterised by all the chromosomes that proceed to lie at the equator.

  1. A stage of mitosis is shown in the diagram. Which stage is it and what are its characteristics? [NEET Kar. 2013]









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    Metaphase chromosome is made up of two sister chromatides which are held together by the centromere. Chromosomes are moved to spindle equator and get aligned along metaphase plate through spindle fibres to both poles.

    Correct Option: C

    Metaphase chromosome is made up of two sister chromatides which are held together by the centromere. Chromosomes are moved to spindle equator and get aligned along metaphase plate through spindle fibres to both poles.

  1. Which stages of cell division do the following figures A and B represent respectively? [2010]









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    The figure A represents late anaphase while figure B represents prophase stage of mitosis.

    Correct Option: C

    The figure A represents late anaphase while figure B represents prophase stage of mitosis.

  1. Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle








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    At the beginning of M phase or mitotic phase, the nuclear membrane and nucleolus disappear. The decondensation of chromosomes occur. But when nuclear envelop start forming then nuclear lamina assemble and chromosomes start condensing.

    Correct Option: B

    At the beginning of M phase or mitotic phase, the nuclear membrane and nucleolus disappear. The decondensation of chromosomes occur. But when nuclear envelop start forming then nuclear lamina assemble and chromosomes start condensing.

  1. Synapsis occurs between :








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    Synapsis is the pairing of two homologous chromosomes that occurs during prophase I (zygotene stage) of meiosis. The two chromosome move together and pairly corresponding along their lengths as they lie side to side. The resulting structure is called a bivalent.

    Correct Option: C

    Synapsis is the pairing of two homologous chromosomes that occurs during prophase I (zygotene stage) of meiosis. The two chromosome move together and pairly corresponding along their lengths as they lie side to side. The resulting structure is called a bivalent.