Can You Answer These Biology MCQs?

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Can You Answer These Biology MCQs? - Quiz

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Questions and Answers
  • 1. 

    A cell at G1 phase that contains 50 ng of DNA, after the end of mitosis each of the daughter cell will be: 

    • A.

      50 ng

    • B.

      25 ng 

    • C.

      100 ng 

    • D.

      None of these above 

    Correct Answer
    A. 50 ng
    Explanation
    During the G1 phase of the cell cycle, the cell's DNA is duplicated. After mitosis, each daughter cell will contain the same amount of DNA as the parent cell. Therefore, each daughter cell will also contain 50 ng of DNA.

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  • 2. 

    When a plant cell that has 100 ng of the DNA at G2 undergoes meiosis, the amount of DNA at prophase is: 

    • A.

      100 ng, 50 ng 

    • B.

      50 ng, 25 ng 

    • C.

      100 ng, 25 ng 

    • D.

      25 ng,12.5 ng 

    Correct Answer
    B. 50 ng, 25 ng 
    Explanation
    During meiosis, the DNA content is halved. In the G2 phase of the cell cycle, the plant cell has 100 ng of DNA. Therefore, at prophase, which is the initial stage of meiosis, the amount of DNA would be reduced by half, resulting in 50 ng of DNA. As meiosis progresses to the second division, the DNA content is halved again, resulting in 25 ng of DNA. Therefore, the correct answer is 50 ng, 25 ng.

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  • 3. 

    Chromosomes will align at the equator of the dividing cell during the: 

    • A.

      Prophase

    • B.

      Metaphase

    • C.

      Anaphase

    • D.

      Telophase 

    • E.

      Cytokinesis 

    Correct Answer
    B. Metaphase
    Explanation
    During metaphase, the chromosomes align at the equator of the dividing cell. This is an important step in cell division called mitosis. In metaphase, the chromosomes condense and become visible under a microscope. They then line up along the center of the cell, forming what is known as the metaphase plate or equatorial plate. This alignment ensures that each new daughter cell receives an equal and complete set of chromosomes during cell division.

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  • 4. 

    Chromosomes will migrate towards the poles of a dividing cell during:

    • A.

      Prophase

    • B.

      Anaphase 

    • C.

      Metaphase

    • D.

      Telophase

    Correct Answer
    B. Anaphase 
    Explanation
    During anaphase, the chromosomes will migrate towards the poles of a dividing cell. This is because the microtubules of the spindle apparatus contract, pulling the sister chromatids apart. As a result, each chromatid is now considered a separate chromosome and they move towards opposite poles of the cell. This movement ensures that each new daughter cell will receive the correct number of chromosomes during cell division.

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  • 5. 

    During_______, homologous chromosomes arrange along their length as pairs in a process called ________ and form what is called __________.

    • A.

      Prophase ||, crossing over , recombinant chromosomes 

    • B.

      Prophase | , crossing over, recombinant chromosomes

    • C.

      Prophase|| , synapsis, recombinant chromosomes

    • D.

      Prophase ||, synapsis, tetrad 

    • E.

      Prophase | , synapsis, terrad 

    Correct Answer
    E. Prophase | , synapsis, terrad 
    Explanation
    During Prophase, homologous chromosomes arrange along their length as pairs in a process called synapsis and form what is called a tetrad.

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  • 6. 

    During the cell cycle DNA will be replicated in the: 

    • A.

      G1 phase

    • B.

      G2 phase 

    • C.

      S phase 

    • D.

      G0 phase 

    Correct Answer
    C. S phase 
    Explanation
    During the S phase of the cell cycle, DNA replication takes place. This is the phase where the cell's DNA is duplicated in preparation for cell division. The S phase is a critical step in the cell cycle as it ensures that each daughter cell receives an identical copy of the genetic material. The G1 and G2 phases are involved in cell growth and preparation for division, while the G0 phase is a resting phase where cells are not actively dividing. Therefore, the correct answer is S phase.

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  • 7. 

    Cytokinesis in an animal cells occurs through _______ while in plant cells it occurs through_____

    • A.

      Cell plant formation, furrowing 

    • B.

      Furrowing, cell plate formation 

    • C.

      Fission, cell plate formation 

    • D.

      Mitosis, furrowing 

    Correct Answer
    B. Furrowing, cell plate formation 
    Explanation
    In animal cells, cytokinesis occurs through furrowing, which is the process of the cell membrane pinching inwards to divide the cytoplasm into two daughter cells. In plant cells, cytokinesis occurs through cell plate formation, where a new cell wall is formed in the middle of the cell, dividing it into two daughter cells.

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  • 8. 

    Homologous chromosomes will be separated during: 

    • A.

      Anaphase

    • B.

      Anaphase |

    • C.

      Anaphase ||

    • D.

      Metaphase | 

    Correct Answer
    B. Anaphase |
    Explanation
    During anaphase, the homologous chromosomes, which are pairs of chromosomes that carry the same genes, are separated and move towards opposite ends of the cell. This process ensures that each resulting daughter cell receives one copy of each chromosome, maintaining the correct number of chromosomes in the offspring. Therefore, the correct answer is "Anaphase |".

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  • 9. 

    Division of the cytoplasm is called? 

    • A.

      Cytokinesis

    • B.

      Mitosis 

    • C.

      Meiosis 

    • D.

      None of these above 

    Correct Answer
    A. Cytokinesis
    Explanation
    Cytokinesis is the correct answer because it refers to the process of dividing the cytoplasm of a cell during cell division. It occurs after the nuclear division (either mitosis or meiosis) and results in the formation of two separate daughter cells. Cytokinesis ensures that each daughter cell receives a complete set of genetic material and necessary organelles.

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  • 10. 

    Mitosis should be preceded by DNA duplication?

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Mitosis is the process by which a cell divides into two identical daughter cells. Before mitosis can occur, the DNA in the cell must be duplicated. This ensures that each daughter cell receives a complete set of genetic information. Therefore, it is true that mitosis should be preceded by DNA duplication.

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  • 11. 

    The longest phase of the cell cycle is? 

    • A.

      Mitotic phase 

    • B.

      Prophase 

    • C.

      Interphase 

    • D.

      Telophase

    Correct Answer
    C. Interphase 
    Explanation
    Interphase is the correct answer because it is the longest phase of the cell cycle. It encompasses the G1 phase, S phase, and G2 phase, during which the cell grows, replicates its DNA, and prepares for cell division. This phase accounts for approximately 90% of the cell cycle and is crucial for the cell to perform its normal functions and prepare for division. Mitotic phase, prophase, and telophase are all part of the cell division process but are relatively shorter compared to interphase.

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  • 12. 

    Ensuring that every thing is ready to go for S phase for DNA duplication is? 

    • A.

      S check point 

    • B.

      G2 check point 

    • C.

      G1 check point 

    • D.

      None 

    Correct Answer
    C. G1 check point 
    Explanation
    The G1 checkpoint is responsible for ensuring that all conditions are met before the cell enters the S phase of DNA duplication. This checkpoint assesses factors such as cell size, nutrient availability, DNA damage, and the presence of growth factors. If any of these conditions are not met, the cell will not proceed to the S phase. Therefore, the G1 checkpoint is crucial in ensuring that everything is ready for DNA duplication in the S phase.

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  • 13. 

    The control point that determined if the cell can go to M phase for division? 

    • A.

      G1 check point 

    • B.

      G2 check point 

    • C.

      S check point 

    • D.

      None 

    Correct Answer
    B. G2 check point 
    Explanation
    The G2 checkpoint is the control point that determines if the cell can proceed to the M phase for division. At this checkpoint, the cell checks for DNA damage and ensures that DNA replication has been completed accurately during the S phase. If any errors or damage are detected, the cell will pause and attempt to repair the DNA before proceeding to division. Therefore, the G2 checkpoint plays a crucial role in maintaining the integrity of the cell's DNA and ensuring the proper progression of the cell cycle.

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  • 14. 

    G0 is part of the cell cycle? 

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    G0 is not part of the cell cycle. The cell cycle consists of four main phases - G1, S, G2, and M. G0 is a resting phase in which cells exit the cell cycle and temporarily stop dividing. It is a non-dividing state that cells enter when they are not actively proliferating or preparing to divide. Therefore, G0 is not considered as part of the cell cycle.

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  • 15. 

    Despiralization happens during which phase? 

    • A.

      Prophase 

    • B.

      Metaphase 

    • C.

      Anaphase 

    • D.

      Telophase 

    Correct Answer
    D. Telophase 
    Explanation
    Despiralization refers to the unwinding of the tightly coiled chromosomes that occurred during prophase. This process allows the chromosomes to separate and move towards opposite ends of the cell during anaphase. Therefore, the correct answer is not Telophase, but rather Anaphase.

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  • 16. 

    The chromosomes don't replicate before the second division in mitosis? 

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    During mitosis, the chromosomes replicate during the interphase before the first division. This results in two identical sister chromatids held together by a centromere. However, before the second division, there is no further replication of the chromosomes. Instead, the sister chromatids separate and move to opposite poles of the cell. Therefore, the statement that chromosomes don't replicate before the second division in mitosis is true.

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  • 17. 

    Crossing over occurs in: 

    • A.

      Prophase ||

    • B.

      Prophase | 

    • C.

      Anaphase || 

    • D.

      Anaphase | 

    Correct Answer
    B. Prophase | 
    Explanation
    Crossing over occurs during Prophase I of meiosis. This is the stage where homologous chromosomes pair up and exchange genetic material through a process called crossing over. This genetic recombination results in the creation of new combinations of alleles on the chromosomes, increasing genetic diversity. Therefore, the correct answer is Prophase |.

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  • 18. 

    During __________ , homologous pair of chromosomes are separated and cells become haploid 

    • A.

      Meiosis 

    • B.

      Meiosis | 

    • C.

      Meiosis || 

    • D.

      None 

    Correct Answer
    B. Meiosis | 
    Explanation
    During meiosis, homologous pairs of chromosomes are separated in a process called "segregation" or "disjunction." This occurs during the first division of meiosis, known as meiosis I. The separation of homologous chromosomes results in the formation of two haploid cells, each containing one set of chromosomes. Therefore, the correct answer is "Meiosis |."

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