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Cell Cycle and Cell Division Test - 86

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Cell Cycle and Cell Division Test - 86
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  • Question 1
    1 / -0
     Beads on string of A are seen in B which condense to form chromosomes in C stage of cell division.
    Solution
    Metaphase is a stage of mitosis in in which chromosomes are at their second most condensed and coiled stage.Chromonema are the coiled mass of threads visible within a nucleus at the beginning of cell division. During metaphase, these threads condense into chromatin and arrange at the equator
  • Question 2
    1 / -0
    During meiosis, replication of DNA occurs in
    Solution
    S phase is recognised by the synthesis of DNA. It doubles the DNA content of the cell and occurs between G$$_1$$ and G$$_2$$ phase. Zygotene and Leptotene are the stages of prophase I and are associated with crossing-over and recombination.
    So, the correct answer is 'S-phase'.
  • Question 3
    1 / -0
    The two chromatids of a metaphase chromosome represent
  • Question 4
    1 / -0
    Which of these is connected with cell division? 
  • Question 5
    1 / -0
    Which is not characteristic of telophase
    1. Chromatin condenses to form chromosomes.
    2. Nucleolus, Golgi complex and ER reform. 
    3. Nuclear envelopes assemble around chromosome clusters. 
    4. Centromeres split, and chromatids separate.
    5. Chromosome clusters and their identity is lost.
    Solution
    • Telophase is the final stage of mitosis, a nuclear envelope forms around each group of chromosomes and cytokinesis occurs, where the cytoplasm divides into two. 
    • The spindle completely disappears and chromosomes undergo reverse of condensation. At the end of telophase, the two daughter cells separate.
    • So, the correct answer is option B.
  • Question 6
    1 / -0
    Identify the correct combination regarding anaphase, anaphase I and anaphase II.
    Solution
    • In anaphase of mitosis division, the centromere of each chromosome split thus, each chromatid has its own centromere.
    • In anaphase I of meiosis I, the homologous chromosome separate out by breaking their connection. 
    • In anaphase II of meiosis II, the centromere of each chromosome split thus, each chromatid has its own centromere.
    So, the correct answer is option A.
  • Question 7
    1 / -0
    Congression is a phenomenon of
    Solution
    The directed movement of the chromosomes into position at the metaphase plate is termed as congression. During congression, the chromosomes come together on the equator of spindle apparatus to form metaphase plate. 
    Thus, the correct answer is option D.
  • Question 8
    1 / -0
    Genes do not occur in pairs in
    Solution

    A.Zygote – genes occur in pairs, because it is diploid.

    B.Somatic cell – genes occur in pairs, because it is diploid.

    C.Endosperm cells – genes occur in three groups, because it is triploid.

    D.Gametes – genes do not occur in pairs, because it is haploid.

    So, the correct option is ‘Gametes’.
  • Question 9
    1 / -0
    Segregation of genes takes place during which phase of the meiosis?
    Solution

    Mendel in his experimental studies stated that, each factor in a pair separate during gamete formation, so that each gamete receives only one factor for each character. It is due to the process of Meiosis.  In meiosis, it occurs during Anaphase – I of meiosis – I.

    So, the correct option is ‘Anaphase – I of meiosis’. 

  • Question 10
    1 / -0
    The nucleus of a diploid organism contains $$3$$ng of DNA in $$G_1$$ phase. Which one of the following statements describes the state of the cell at the end of S phase?
    Solution
    During G1 phase, the cell  grows and makes a variety of proteins that are needed for DNA replication. During S phase, which follows G1 phase, all the chromosomes are replicated. Following replication, each chromosome now consists of two sister chromatids. Thus, the amount of DNA in the cell has effectively doubled, even though the ploidy, or chromosome count, of the cell remains at 2n. Chromosomes double their number of chromatids post replication but the nuclei remains diploid as the number of centromeres and chromosomes remains unchanged. Hence, there is no division of the nucleus but there is a change in the amount of DNA in the cell (it is doubled), i.e. it changes to 6ng from 3ng.
    So, the answer is D.
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