Science Quiz (Introduction To Cell And Cell Structure) Jean Claude Niyomugabo

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Quizzes Created: 1 | Total Attempts: 179
Questions: 19 | Attempts: 179

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Science Quiz (Introduction To Cell And Cell Structure) Jean Claude Niyomugabo - Quiz

This Quiz contains multiple-choice question only You are allowed to use only 19 minutes to answer all questions Good luck and enjoy


Questions and Answers
  • 1. 

     ......It is organelles which protects and supports the cell, controls everything that enters and leaves the cell, and recognizes chemical signals?

    • A.

      Protoplasm  

    • B.

      Cytoplasm

    • C.

      Nucleus

    • D.

      Plasma  membrane

    Correct Answer
    D. Plasma  membrane
    Explanation
    The plasma membrane is the correct answer because it is responsible for protecting and supporting the cell, controlling what enters and leaves the cell through selective permeability, and recognizing chemical signals through receptors embedded in the membrane. It acts as a barrier between the cell and its external environment, allowing it to maintain homeostasis and communicate with other cells.

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  • 2. 

    ............. is the "power plant of cell"

    • A.

      Cytoplasm

    • B.

      Mitochondria

    • C.

      Plasma Membrane

    • D.

      Plastids

    Correct Answer
    B. Mitochondria
    Explanation
    Mitochondria is often referred to as the "power plant of the cell" because it is responsible for producing the majority of the cell's energy in the form of ATP through cellular respiration. This organelle contains its own DNA and is able to generate energy by breaking down glucose and other molecules in the presence of oxygen. The energy produced by mitochondria is essential for various cellular processes, including metabolism, growth, and reproduction.

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  • 3. 

    Yeast is an example of

    • A.

      Prokaryotic cell

    • B.

      Eukaryotic cell

    • C.

      Plant cell

    • D.

      Complete cells

    Correct Answer
    B. Eukaryotic cell
    Explanation
    Yeast is an example of a eukaryotic cell because it possesses a nucleus and other membrane-bound organelles. Eukaryotic cells are typically found in organisms such as plants, animals, fungi, and protists. They are characterized by their complex internal structure and ability to perform various specialized functions. Yeast, a type of fungus, is a single-celled organism that exhibits eukaryotic characteristics, making it an example of a eukaryotic cell.

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  • 4. 

    ....................is organelle that helps make and transport proteins and lipids,

    • A.

      Endoplasmic recticulum

    • B.

      Cilia

    • C.

      Golgi apparatus

    • D.

      Peroxisomes

    Correct Answer
    A. Endoplasmic recticulum
    Explanation
    The endoplasmic reticulum (ER) is an organelle that helps make and transport proteins and lipids. It is a network of membranous tubules and sacs located in the cytoplasm of eukaryotic cells. The ER plays a crucial role in protein synthesis, folding, and modification. It also participates in lipid synthesis and detoxification of drugs and toxins. The ER is connected to the nuclear envelope and is divided into two regions: rough ER, which is studded with ribosomes and involved in protein synthesis, and smooth ER, which lacks ribosomes and is involved in lipid metabolism and detoxification.

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  • 5. 

    ....................contain digestive enzymes

    • A.

      Ribosomes

    • B.

      Chloroplast

    • C.

      Mitochondrion

    • D.

      Lysosomes

    Correct Answer
    D. Lysosomes
    Explanation
    Lysosomes are organelles that contain digestive enzymes. These enzymes help break down waste materials, cellular debris, and foreign substances within the cell. Lysosomes play a crucial role in cellular digestion and recycling of cellular components. They are responsible for maintaining the overall health and functioning of the cell by removing unwanted materials and recycling them for energy or building new molecules. Therefore, the correct answer is lysosomes.

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  • 6. 

    …………………. are organelles that are involved in cell division and are found in the cytoplasm near the nucleus.

    • A.

      Centrioles

    • B.

      Ribosomes

    • C.

      Golgi Apparatus

    • D.

      Mitochondrion

    Correct Answer
    A. Centrioles
    Explanation
    Centrioles are organelles that are involved in cell division and are found in the cytoplasm near the nucleus. They play a crucial role in organizing the microtubules that make up the cell's cytoskeleton and are necessary for the formation of the spindle fibers during cell division. Centrioles are also involved in the movement of chromosomes during cell division, ensuring that each daughter cell receives the correct number of chromosomes. Therefore, the presence of centrioles near the nucleus is important for their proper functioning in cell division.

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  • 7. 

    The genetic characters are determined by ……………

    • A.

      Mitochondrion

    • B.

      Golgi bodies

    • C.

      Ribosomes

    • D.

      Nucleus

    Correct Answer
    D. Nucleus
    Explanation
    The genetic characters are determined by the nucleus. The nucleus contains the DNA, which carries the genetic information that determines an organism's characteristics. The DNA is transcribed into RNA, which is then translated into proteins that play a role in determining the organism's traits. The mitochondrion, Golgi bodies, and ribosomes all have important functions in the cell, but they do not directly determine the genetic characters of an organism.

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  • 8. 

    Name the `protein factories of the cell’ …………………

    • A.

      Mitochondrion

    • B.

      Cytoplasm

    • C.

      Cytoplasm

    • D.

      Ribosomes

    Correct Answer
    D. Ribosomes
    Explanation
    Ribosomes are the protein factories of the cell. They are responsible for protein synthesis, where they translate the genetic information from the DNA into proteins. Ribosomes can be found in the cytoplasm of the cell, as well as on the rough endoplasmic reticulum. They play a crucial role in the production of proteins, which are essential for various cellular processes and functions. Mitochondria are responsible for energy production, while the cytoplasm is the fluid-filled region of the cell where various cellular activities occur. Therefore, the correct answer is Ribosomes.

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  • 9. 

    ....................is a rigid layer that surrounds the plasma membrane of a plant cell

    • A.

      Nucleus

    • B.

      Cell wall

    • C.

      Ribosomes

    • D.

      Mitochondria

    Correct Answer
    B. Cell wall
    Explanation
    The cell wall is a rigid layer that surrounds the plasma membrane of a plant cell. It provides structural support and protection to the cell, helping to maintain its shape and prevent it from bursting under pressure. The cell wall is composed of cellulose, a complex carbohydrate that gives it its rigidity. Unlike animal cells, which do not have a cell wall, plant cells rely on this structure for support and to withstand environmental stresses.

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  • 10. 

    ………………is a liquid in the nucleus that surround nucleolus and chromatins

    • A.

      Nucleus

    • B.

      Ribosomes

    • C.

      Nucleoplasm

    • D.

      Lysosomes

    • E.

      Cell membrane

    Correct Answer
    C. Nucleoplasm
    Explanation
    Nucleoplasm is the correct answer because it is a liquid found in the nucleus of a cell. It surrounds the nucleolus and chromatins, providing a medium for various cellular activities. The nucleoplasm contains various molecules, such as enzymes, proteins, and nucleotides, which are essential for gene expression and DNA replication. It also helps in maintaining the structural integrity of the nucleus and provides a suitable environment for the storage and transport of genetic material.

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  • 11. 

    ................. absent in plant cell

    • A.

      Cell wall

    • B.

      Ribosomes

    • C.

      Centrioles

    • D.

      Cell membrane

    • E.

      Nucleus

    Correct Answer
    C. Centrioles
    Explanation
    Centrioles are absent in plant cells. Centrioles are small cylindrical structures found in animal cells that play a role in cell division. They are involved in the formation of spindle fibers during cell division, aiding in the separation of chromosomes. Plant cells, on the other hand, do not have centrioles. Instead, they rely on other structures, such as the microtubule organizing centers, to perform similar functions during cell division. Therefore, the absence of centrioles is a characteristic feature of plant cells.

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  • 12. 

    .Which of the following maintains the intracellular pressure in animal cell …………….

    • A.

      Lysosomes

    • B.

      Vacuoles

    • C.

      Golgi bodies

    • D.

      Ribosomes

    Correct Answer
    B. Vacuoles
    Explanation
    Vacuoles maintain the intracellular pressure in animal cells. Vacuoles are membrane-bound organelles that store various substances such as water, ions, and nutrients. They help regulate the osmotic balance within the cell by controlling the movement of water and solutes. By storing and releasing water, vacuoles can regulate the internal pressure of the cell, maintaining its shape and stability. Additionally, vacuoles can also play a role in cellular waste management and detoxification.

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  • 13. 

    Which one of the following is not a plastid?

    • A.

      Cell wall

    • B.

      Chroloplast

    • C.

      Chromoplast

    • D.

      All above

    Correct Answer
    A. Cell wall
    Explanation
    Plastids are a group of organelles found in plant cells that are involved in various functions such as photosynthesis, storage, and pigment synthesis. Chloroplasts and chromoplasts are examples of plastids. However, the cell wall is not a plastid. The cell wall is a rigid structure made of cellulose that surrounds the cell membrane and provides support and protection to the cell. Unlike plastids, the cell wall does not contain any specialized pigments or participate in photosynthesis. Therefore, the correct answer is "Cell wall."

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  • 14. 

    Which is absent in animal cell?

    • A.

      Cell wall

    • B.

      Chloroplast

    • C.

      Chromoplast

    • D.

      All above

    Correct Answer
    D. All above
    Explanation
    Animal cells do not have a cell wall, chloroplasts, or chromoplasts. The cell wall is a rigid structure found in plant cells that provides support and protection. Chloroplasts are responsible for photosynthesis in plant cells, converting sunlight into energy. Chromoplasts are specialized plastids that store pigments in plant cells. Since animal cells lack all of these structures, the correct answer is "all above".

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  • 15. 

    Which of the following is responsible for the formation of new cells?

    • A.

      Cell wall

    • B.

      Vacuoles

    • C.

      Ribosomes

    • D.

      Centrosomes

    Correct Answer
    D. Centrosomes
    Explanation
    Centrosomes are responsible for the formation of new cells. Centrosomes play a crucial role in cell division, specifically in the formation of the mitotic spindle during cell division. The mitotic spindle helps to separate the replicated chromosomes into two daughter cells, ensuring that each new cell receives a complete set of genetic material. Therefore, centrosomes are essential for the formation of new cells through cell division.

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  • 16. 

    Example of single-celled organism is

    • A.

      Fungi

    • B.

      Chlolela

    • C.

      Amoeba

    • D.

      All of them

    Correct Answer
    C. Amoeba
    Explanation
    Amoeba is an example of a single-celled organism. It is a microscopic, unicellular organism that belongs to the group of protozoans. Amoebas are characterized by their ability to constantly change their shape, as they do not have a fixed body structure. They move by using pseudopods, which are temporary projections of their cytoplasm. Amoebas are found in various freshwater and marine environments, as well as in soil. They are capable of both asexual and sexual reproduction, and they obtain their nutrition by engulfing and digesting small particles of food.

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  • 17. 

    Organisms made up of huge amount of cells(like humans) are known as

    • A.

      Multicellular

    • B.

      Unicellular

    • C.

      Epithellial

    • D.

      Epidermal

    Correct Answer
    A. Multicellular
    Explanation
    Multicellular organisms are made up of a large number of cells working together to form tissues, organs, and systems. Humans, being composed of trillions of cells, are an example of multicellular organisms. This term accurately describes the organization and complexity of their cellular structure. Unicellular organisms, on the other hand, consist of only a single cell, while epithelial and epidermal refer to specific types of tissues found in multicellular organisms.

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  • 18. 

    Which statement about unicellular organisms is true?

    • A.

      Unicellular organisms carry out many of the same activities as multicellular organisms

    • B.

      Unicellular organisms all have the same basic structure

    • C.

      Unicellular organisms are most often larger than the tip of a pen

    • D.

      Unicellular organisms can only survive in warm dry environments

    Correct Answer
    A. Unicellular organisms carry out many of the same activities as multicellular organisms
    Explanation
    Unicellular organisms carry out many of the same activities as multicellular organisms because they are living entities that need to perform essential functions such as obtaining nutrients, reproducing, and responding to their environment. While they may differ in complexity and specialization, unicellular organisms still carry out processes like metabolism, growth, and movement, similar to multicellular organisms.

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  • 19. 

    Which of the following is the best definition of cell?

    • A.

      Cell is like the block of living organisms

    • B.

      All cells must be multicellular or unicellular

    • C.

      Cell were named after its invention by Robert hooke

    • D.

      Cell is both a structural  and functional unit of living organisms

    • E.

      All of above

    Correct Answer
    D. Cell is both a structural  and functional unit of living organisms
    Explanation
    The best definition of a cell is that it is both a structural and functional unit of living organisms. This means that cells are the basic building blocks of all living things and they carry out all the necessary functions for life. They can exist as single-celled organisms or as part of a larger multicellular organism. This definition encompasses all the other options provided, making it the most comprehensive and accurate choice.

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