Self Studies
Self Studies
Self Studies
Self Studies
Selfstudy
Selfstudy

Cell Cycle and Cell Division Test - 24

Result Self Studies

Cell Cycle and Cell Division Test - 24
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    1 / -0
    First meiosis occurs in
    Solution
    In higher animals like humans, spermatogonia proliferate by mitosis. Some of the spermatogonia mature into primary spermatocytes. Some of the primary spermatocytes undergo meiosis I to produce haploid secondary spermatocytes. Two secondary spermatocytes are produced per primary spermatocyte. The haploid secondary spermatocytes divide by meiosis II to produce two spermatids. Each secondary spermatocyte produces two spermatids. Thus, a total of four spermatids are produced per primary spermatocyte.

  • Question 2
    1 / -0
    In cell cycle, the mRNA needed for protein synthesis occurs in which of the following?
    Solution
    A typical cell cycle comprises of interphase and mitotic phase. The interphase comprises of first growth phase (G$$_1$$phase), synthesis phase (S phase) and second growth phase (G$$_2$$phase). The G$$_1$$ phase is a very active phase of cell cycle. It starts immediately after completion of mitosis and lasts until start of S phase of interphase. Hence, it is also called post-mitotic gap period. Proteins required for DNA replication are synthesized during G$$_1$$ phase. Hence, mRNA required for protein synthesis are abundant in G$$_1$$or post-mitotic gap phase.
    So, the correct answer is option B.
  • Question 3
    1 / -0
    Genetic crossing over usually takes place during 
    Solution
    Living organisms show two types of cell division- mitosis and meiosis. The meiosis occurs in two stages meiosis I and meiosis II. Meiosis I is characterised by the pairing of homologous chromosomes, crossing over between homologous chromosomes and separation of homologous chromosomes, so that each daughter cell produced after meiosis I have one-half the chromosome number as compared to the parent cell.
    So, the correct answer is option A.
  • Question 4
    1 / -0
    ........... is the 'post mitotic phase' of the cell in which active synthesis of RNA and proteins takes place.
    Solution
    A typical cell cycle comprises of interphase and mitotic phase (M phase). The interphase comprises of first growth phase or G$$_1$$ phase, synthesis phase or S phase and second growth phase or G$$_2$$ phase. The DNA synthesis occurs during S phase in the process of DNA replication. The S phase is followed by G$$_2$$ phase, after which the cell enters mitotic phase. The G$$_1$$ phase starts immediately after the mitotic phase and leads to the S phase. Hence, G$$_1$$ is also called the post mitotic phase. It is during G$$_1$$ phase that cell prepares for DNA replication and synthesis of DNA. The G$$_1$$ phase is the phase for active protein synthesis. Various species of RNA, all the enzyme machinery and other proteins required for DNA replication are synthesized during G$$_1$$ phase.
    So, the correct answer is option C.
  • Question 5
    1 / -0
    If you are provided, with root-tips of onion in your class and asked to count the chromosomes, which of the following stages will be most conveniently observed?
    Solution
    Chromosomes are tightly coiled, shortest and most clearly visible in metaphase stage neatly arranged on the metaphase plate at the equator of the cell. Hence, metaphase stage is best suited to study the number and morphology of the chromosomes.
    So, the correct answer is option A.
  • Question 6
    1 / -0
    Meiosis is important for evolution because of 
    Solution
    Meiosis produces haploid gametes. The haploid gametes are produced after crossing over between non sister chromatids of homologous chromosomes. This gives rise to new combinations of genetic material and creates diversity which ultimately is acted upon by natural selection. The meiosis occurs in two stages: meiosis I or reductional division and meiosis II or equational division. The reductional division is important for generating diversity and reducing the number of chromosomes to one half. The equational division is important for splitting of centromere and separation of sister chromatids, else the gametes will have double or bivalent chromosomes and when these gametes fuse the zygote will have all duplicated chromosomes even before the S phase. This will ultimately result in excess DNA and genetic mutations such as polyploidy.
  • Question 7
    1 / -0
    HeLa cells used for the study of cell division, are
    Solution
    A HeLa is a human cell line which is immortal in nature. It has the potential to survive longer and divide incessantly. The line was derived from cervical cancer cells taken on February 8, 1951, from Henrietta Lacks, a patient who eventually died of her cancer on October 4, 1951. The cells from Henrietta's tumor were taken by researcher George Gey, who "discovered that [Henrietta's] cells could be kept alive and grow indefinitely. 
    So, the correct answer is option B.
  • Question 8
    1 / -0
    When energy is stored and the cell undergoes differentiation in adverse conditions, the stage is called ______.
    Solution
    The typical cell cycle comprises of interphase and mitotic phase (M phase). The interphase is divided into the first growth phase (G$$_1$$ phase), synthesis phase (S phase), and second-growth phase (G$$_2$$ phase). DNA replication occurs during the synthesis or S phase. Non-proliferative cells in multicellular eukaryotes generally enter the quiescent G$$_o$$ state from G$$_1$$ and may remain quiescent for long periods of time. Therefore, G$$_o$$ is also called a differential stage during which some cells enter permanent differentiation. Thus, the correct answer is option B.
  • Question 9
    1 / -0
    In meiosis I, the centromere undergoes
    Solution
    Meiosis occurs in two stages - meiosis I and meiosis II. The meiosis I is characterised by pairing of homologous chromosomes, crossing over and separation of homologous chromosomes. The centromere remains intact during meiosis I and homologous chromosomes separate. Thus, the number of chromosomes in progeny nuclei is reduced to one half. In meiosis II, just as mitosis, centromere separate and, hence, the number of chromosomes in the progeny remains same.
  • Question 10
    1 / -0
    If 2n = 14, (n = 7), then what will happen during meiosis?
    Solution
    During meiosis, the homologous chromosomes pair and exchange segments then they are separated into separate gametes. If in a cell the diploid chromosome number is 14, during meiosis there will form seven pairs of homologous chromosomes. The two chromosomes in each of these seven pairs will exchange segments leading to mixing of characters. Following the exchange of segments, one chromosome from each of the seven pairs will be passed on two daughter cells which in turn will divide by the process of mitosis into two cells each giving rise to four haploid gametes. The haploid gametes will fuse and In the next generation mixed or crossed or jumbled or new combinations of characters will be passed on to progeny.
Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now