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Cell The Unit of Life Test - 22

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Cell The Unit of Life Test - 22
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  • Question 1
    1 / -0
    Darkly stained structure present below the nuclear envelope in human cells is?
    Solution
    The answer is option (B) Nucleolus.
    Nucleolus contains a high number of ribosomal RNA.
    rRNA is densely arranged in nucleolus so when it comes in the contact with the dye. It accumulates more amount of dye and because of more dye, it looks darkly stained under the microscope.


  • Question 2
    1 / -0
    If the ribosomes of a cell are destroyed then
    Solution
    ribosomes of a cell are known as protein factory of the cell because they are the site of active translation and are involved in protein synthesis. So, the correct option is D. ( Proteins will not be synthesized )
  • Question 3
    1 / -0
    Which statement is NOT correct for mitochondria
    Solution
    Both animal and plant cells have mitochondria, but only plant cells have chloroplasts. Plants don't get their sugar from eating food, so they need to make sugar from sunlight. This process (photosynthesis) takes place in the chloroplast
    So, the correct answer is 'they are found in animal cells only, plants cell have chloroplast instead
    So, the correct answer is 'they are found in animal cells only; plant cell have chloroplast instead 
  • Question 4
    1 / -0
    Where does glycosylation of protein occurs?
    Solution
    • Electron microscopic studies of eukaryotic cells reveal the presence of a network or reticulum of tiny tubular structures scattered in the cytoplasm that is called the endoplasmic reticulum (ER).
    • The addition of a carbohydrate moiety to a protein molecule is referred to as protein glycosylation. It takes place in the ER(Endoplasmic Reticulum) and in the Golgi Apparatus body of the cell.
    • Hence glycosylation of protein occurs in Endoplasmic reticulum.
    • So, the correct answer is 'Endoplasmic reticulum'.
  • Question 5
    1 / -0
    A spherical shaped structure present in the centre of an animal cell is known as_____.
    Solution
    • The nucleus is the centrally located small spherical structure in an animal cell. It regulates and coordinates various activities of the cell. 
    • The cytoplasm is the semi-liquid, colorless, and translucent part of the cell. It is found between the cell membrane and nucleus.
    • A vacuole is found in the cytoplasm and helps to transport a number of ions against the concentration gradient, excretion, etc. It may or may not be present in an animal cell, if present is very small.
    • Plastid is the largest cell organelle. Animal cell lacks plastids. They bear some specific pigments and imparting specific colours to the plant.
    Thus, Option B is correct.
  • Question 6
    1 / -0
    Cell wall of plant cell is mainly made up of_________.
    Solution
    The cell wall is only present in a plant cell, which gives a definite shape and structure to the plant cell. The cell wall of the plant is mainly made up of cellulose. It is a non-living part of the plant cell.
    So, the correct answer is option A. 
  • Question 7
    1 / -0
    If living cells similar to those found on earth, were found on another planet where there was no oxygen. Which cell organelle would most probably be absent?
    Solution
    If the other planet lacks oxygen then mitochondria would most probably be absent because aerobic respiration occurs in mitochondria. 
  • Question 8
    1 / -0
    Who observed the mitochondria first?
    Solution
    Albert von Kolliker discovered the existence of mitochondria in 1857. He observed the strange granules while studying the muscle cells in insect.
  • Question 9
    1 / -0
    Which of the following constitutes biological membrane?
    Solution
    Plasma membrane is the common outer covering of all the cell and composed of a bilayer of phospholipids with the phosphate groups on the surface and lipids embedded inside the membrane not exposed to the surface. Also, several proteins are interspersed in the membrane like a mosaic. Integral membrane proteins traverse the entire width of the membrane while surface proteins are present only on the surface. Thus, the correct answer is option B.
  • Question 10
    1 / -0
    Select the correct statement from the following regarding cell membrane.
    Solution
    Singer and Nicolson gave the fluid mosaic model to explain the structure of cell membrane in 1972. According to this model, cell membranes are quasi-fluid with a viscous lipid bilayer having proteins distributed at places both on the surface and inside
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