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Cell The Unit of Life Test - 51

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Cell The Unit of Life Test - 51
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  • Question 1
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    Which of the following structures would be absent in E. coli after its centrifugation using standard laboratory protocols?
  • Question 2
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    An organelle bounded by a membrane and is responsible for synthesis of secreted proteins is
  • Question 3
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    Which membrane bound organelle contains hydrolytic enzymes?
    Solution
    Lysosomes are very minute round or irregularly shaped bag like particles containing enzymes which are bounded by membrane outside. Lysosomes contain about 24 hydrolytic enzymes. Thus option E is the correct answer.
  • Question 4
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    ................ is present inside the nucleus of a cell.
    Solution
    • Chromatin is a complex of DNA and proteins that form chromosomes within the nucleus of eukaryotic cells. Nuclear DNA does not appear in free linear strands. It is highly condensed and wrapped around nuclear proteins in order to fit inside the nucleus.
    • Mitochondria, ribosomes, endoplasmic reticulum and centriole are found inside the nucleus, but outside the nucleus.
    So option D is correct. 
  • Question 5
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    The function of lysosomal membrane is _________.
    Solution

    The lysosomal membrane, which has a typical single phospholipid bilayer, controls the passage of material into and out of lysosomes, by its permeability and ability to fuse with digestive vacuoles or engulf cytosolic material. The membrane prevents enzymes from digesting cellular components and macromolecules. Lysosomal enzymes are activated at the acidic pH of the lysosome and inactivated at higher pH of the cytosol. This protects the cell in case the lysosomal enzyme are released in cytoplasm.

    So, the correct option is 'A'.

  • Question 6
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    The organelle found in large numbers in muscle cells which produces more energy as compared to other cells is
    Solution
    Mitochondria play a critical role in the generation of metabolic energy in eukaryotic cells. They are responsible for most of the useful energy derived from the breakdown of carbohydrates and fatty acids, which is converted to ATP by the process of oxidative phosphorylation. Muscle cells have many mitochondria, which allow them to respond quickly to the need for doing work. 
  • Question 7
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    Which of the following feature differentiates Monera from other kingdoms?
    Solution
    The kingdom Monera is composed of prokaryotic organisms and is divided into two groups, archaebacteria and eubacteria. These organisms are unicellular or multicellular prokaryotes, which do not have well-developed cell organelles such as the nucleus, mitochondria, chloroplast, etc. 
    Thus, the correct answer is option 'All monerans are prokaryotes'. 
  • Question 8
    1 / -0
    In the given membrane structure, water molecules can be found on the part labelled as

    Solution
    The image shows amphipathic phospholipids containing hydrophilic head and hydrophobic tail. The cell membranes are composed primarily of two layers of phospholipid molecules with all the hydrophilic ends of phospholipids directed toward the inner and outer surfaces (I and II) and the hydrophobic ends buried within the interior (III). Thus, the correct answer is A. 
  • Question 9
    1 / -0
    The energy generation takes place in
    Solution
    Mitochondria is the double membrane bound organelle. It is also known as the powerhouse of the cell because it generates and stores energy in the form of ATP.  The mitochondrial matrix and cristae possess several respiratory enzymes which involve in the oxidation of food and energy production.
    Hence, option B is correct.
  • Question 10
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    The protein factories of cells are __________.
    Solution
    Ribosomes are the microparticles of ribonucleoprotein found in the cell, hence they are called RNP particles. Ribosomes are the main sites of protein synthesis where synthesis of protein occurs. They are therefore called protein factory of the cell. Thus option A is the correct answer.
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