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Cell Biology Test - 18

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Cell Biology Test - 18
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  • Question 1
    1 / -0

    Plants show mitotic divisions in

    Solution

    Mitosis is the type of cell division that ensures equal distribution of genetic material in daughter cells. Mitosis can occur both in diploid and haploid cells.
    The main function of mitosis is to make copies of cells for growth and regeneration.

  • Question 2
    1 / -0

    Plant Cytokinesis differ from animals Cytokinesis in having

    Solution

    In plants, cytokinesis or division of cytoplasm occurs due to the formation of the cell plate.

    In animals, cytokinesis occurs due to the formation of constriction in the middle cell membrane.

  • Question 3
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    Cell growth results in disturbing the ratio between

    Solution

    Cell growth results in disturbing the ratio between the nucleus and the cytoplasm.
    Therefore, it becomes essential for the cell to divide to restore the nucleo-cytoplasmic ratio.

  • Question 4
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    Chromosome appeared beaded during

    Solution

    Chromosome appeared beaded during the leptotene stage of the prophase of meiosis I of meiosis cell division.
    Chromatin materials start condensing after that stage.

  • Question 5
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    The transition period between M- phase I and M- phase II in without DNA replication

    Solution

    The transition period between the M-phase of Meiosis I and M-phase II during which no replication of DNA occurs is called interkinesis.

  • Question 6
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    What is the average cell cycle span for a mammalian cell?

    Solution

    The average cell cycle span for a mammalian cell is approximately 24 hours.

  • Question 7
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    Various phases of cell cycle are controlled by proteins

    Solution

    Cycline and CDKs enzymes are involved in controlling various phases of cell cycle.
    CDKs can modify various protein substrates involved in cell cycle progression.

  • Question 8
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    In some lower plants and social insects, the haploid cells are divided by

    Solution

    In some lower plants and in some social insects haploid cells also divide by mitosis.

  • Question 9
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    During which stage of prophase I the crossing over takes place?

    Solution

    Pachytene: During the third substage of meiosis, the chromosomes continue to condense. Crossing over takes place at this stage and at each point of crossing over a chiasma is formed (singular: chiasma) between non-sister chromatids of homologous chromosomes.

  • Question 10
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    The number of chromosome and the amount of DNA are changed in

    Solution

    • S phase marks the period during which DNA synthesis or replication takes place. During this time the amount of DNA per cell doubles.
    • After metaphase is complete, the cell enters anaphase. During this time, the microtubules attached to the kinetochores contract, which pulls the sister chromatids apart and toward opposite poles of the cell 

  • Question 11
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    Which phase is called an invisible phase? 

    Solution

    S Phase because in this phase chromosomes replicated are divided in such a way as to ensure that each daughter cell receives a copy of every chromosome.

  • Question 12
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    M- phase in mitosis undergoes which type of division?

    Solution

    Since, in mitosis the number of chromosomes in the parent and progeny cells is the same, it is also called as equational division.

  • Question 13
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    Which phase of meiosis in animal cell is shown in figure given below?

     

    Solution

    The figure given above shows diakenisis phase of prophase of meiosis I as terminalisation of chismata is  visualized in it.

  • Question 14
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    Who stated first of all that new cells are formed from division of pre-existing cells?

    Solution

    Rudolf Virchow was the first scientist who stated that new cells are formed from division of pre-existing cells.

  • Question 15
    1 / -0

    In yeast the cell cycle is progressed through

    Solution

    Yeast can progress through the cell cycle in only about 90 minutes.

  • Question 16
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    Multinucleate condition arise when Cytokinesis does not follow karyokinesis, this type of cells are called as

    Solution

    Coenocyte is a multinucleate mass of protoplasm which is formed as a result of repeated nuclear division which is not accompanied by the cell fission, whereas the Syncytium is the multinucleated cell which is formed by the fusion of the multiple unicellular cell.

  • Question 17
    1 / -0

    In plant cells, the new cell wall begins by the

    Solution

    In plant cells, wall formation starts in the centre of the cell and grows outward to meet the existing lateral walls.
    The formation of the new cell wall begins with the formation of a simple precursor, called the cell plate.

  • Question 18
    1 / -0

    Crossing over results in the exchange of genetic material, which occurs between:

    Solution

    Crossing over is the exchange of genetic material between two homologous chromosomes.

  • Question 19
    1 / -0

    Two similar chromosomes of each type present in diploid cell are called as

    Solution

    Homologous chromosomes are two similar chromosomes of each type present in diploid cells.
    During meiosis homologous chromosomes separate from each other.

  • Question 20
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    M phase represents

    Solution

    The M Phase represents the phase when the actual cell division or mitosis occurs

  • Question 21
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    The mechanism of distributing centriole pairs to the daughter cells is called

    Solution

    The mechanism of distributing chromosome by centriole pairs to the daughter cells is called astral division. This kind of division occurs in animal cells.

  • Question 22
    1 / -0

    In between two walls of adjacent cells are seen

    Solution

    The middle lamella serves as a cementing layer between the primary walls of adjacent cells.
    The primary wall is the cellulose-containing layer laid down by cells that are dividing and growing. 

  • Question 23
    1 / -0

    The sexual reproduction involves fusion of special type of cell called gametes, produced by

    Solution

    Meiosis cell division is involved in gametes formation as gametes contain half the numbers of chromosome a normal cell diploid cell contain.
    Gametes fuse to produce zygote.

  • Question 24
    1 / -0

    Astral body are formed of

    Solution

    Astral bodies are formed of microtubules.
    They are produced by centriole during cell division and attach with the centromere of the chromosome.

  • Question 25
    1 / -0

    Which of these processes involve meiosis?

    Solution

    Gametogenesis is the formation of gametes from some specialized diploid cells. Since gametes are haploid, gametogenesis involves in the reduction of chromosome number by half through meiosis.

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