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Cell The Unit of Life Test - 59

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Cell The Unit of Life Test - 59
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  • Question 1
    1 / -0
    Lysosomes contain
    Solution
    • Lysosomes are membrane-bound organelles which are capable of breaking down biomolecules such as proteins, nucleic acids, carbohydrates and lipids.
    • They contain digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
    • So, the correct answer is 'Hydrolases'.
  • Question 2
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    Which cell organelle reduces the number of other organelles?
    Solution
    • The cell organelle which reduces the number of other organelles is lysosomes.
    • Lysosomes are membrane-bound organelles which are capable of breaking down biomolecules such as proteins, nucleic acids, carbohydrates and lipids.
    • They contain digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
    • So, the correct answer is 'Lysosome'.
  • Question 3
    1 / -0
    Nissl granules are formed from
    Solution
    • Nissl granules can be defined as a large granular body found in the nerve cells or neurons.
    • They are also known as Nissl substance or Nissl body or Nissl materials which are stained with basic dyes.
    • They are formed by rough endoplasmic reticulum (RER) having rosettes of free ribosomes (polyribosomes) which are a site of protein synthesis.
    • So, the correct answer is 'RER'.

  • Question 4
    1 / -0
    Nucleus was discovered by
    Solution
    Correct Option: C
    Explanation:
    • Robert Brown was a Scottish life scientist and paleobotanist who discovered the nucleus and discovered that each and every animal are the product of cells. 
    • The cell nucleus​ could be a membrane-shaped structure that consists of a cell's hereditary statistics and controls its extension and copy.
    •  It is the command center of a organism cell and is typically the foremost notable cell organ in each size and performance.
    •  Hence, Nucleus was discovered by Robert Brown.
  • Question 5
    1 / -0
    A unit membrane is absent over
    Solution
    • Unit membrane refers to the limiting membrane of cells and cellular organelles which is composed of 3-layered structure- an inner lipid layer and two outer protein layers.
    • This unit membrane surrounds most of the cellular organelles (Golgi apparatus, microbody, lysosomes etc.).
    • Ribosomes are non-membranous cellular organelle thus, it lacks a unit membrane,
    • So, the correct answer is 'Ribosome'.
  • Question 6
    1 / -0
    Protein synthesis occurs in an animal cell in
    Solution
    • Ribosomes are known as protein factories because they are the main site of protein synthesis. 
    • They are composed of ribonucleic acids and proteins.
    • They occur freely in the matrix of mitochondria, cytoplasm and are also present on the rough endoplasmic reticulum.
    • Protein synthesis occurs in mitochondria, chloroplasts, cytoplasm and also RER.
    • So, the correct answer is 'Cytoplasm as well as mitochondria'.
  • Question 7
    1 / -0
    E.R. was discovered by
    Solution
    • The endoplasmic reticulum (smooth and rough) is an interconnected network of flattened, membrane-enclosed sacs or tube-like structure which are evenly distributed throughout the cytoplasm.
    • Endoplasmic reticulum was first seen by Keith R. Porter, Albert Claude and few others in the year 1945.
    • It was discovered by Porter (1945) and Thompson (1945) independently. 
    • So, the correct answer is 'Both B and C'.
  • Question 8
    1 / -0
    Percentage of cell membranes contained in endoplasmic reticulum is __________.
  • Question 9
    1 / -0
    E.R. is more developed in ___________.
    Solution
    The endoplasmic reticulum is a membranous network of tubular structures. It is more developed in mature cells because as cells get mature the number of endoplasmic reticulum also increases.
    Thus, C is the correct answer. 
  • Question 10
    1 / -0
    E.R. is made of 
    Solution
    • The endoplasmic reticulum (smooth and rough) is an interconnected network of flattened, membrane-enclosed sacs or tube-like structure which are evenly distributed throughout the cytoplasm.
    • The rough endoplasmic reticulum consists of cisterna (flattened membranous disk) which helps in modifying and packaging proteins.
    • Whereas, the smooth endoplasmic reticulum is mainly made up of vesicles and tubules.
    • It forms a network of tubular membrane vesicles (small, spherical membrane-bound sacs) which is involved in the synthesis and storage of lipids (cholesterol and phospholipids).
    • The tubules connect the endoplasmic reticulum to the nuclear envelope which forms a continuous membrane.
    • So, the correct answer is 'All of the above'.
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