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Cell The Unit of Life Test - 40

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Cell The Unit of Life Test - 40
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  • Question 1
    1 / -0
    The inner membrane of mitochondria is folded because
    Solution
    Mitochondrion possesses double membrane as its covering. The outer smooth surface and the inner membrane forms infoldings called as cristae, which increases surface area for more formation of energy in the form of ATP. 
  • Question 2
    1 / -0
    What is a prokaryotic cell?
    Solution
    Correct option - C
    Explanation for correct option - 
    • The cells which don't have a true nucleus and lacks membrane-bound organelles are termed prokaryotic cells. 
    • In these cells the DNA bundles together in a region which is called the nucleoid. These are small simple cells. Examples of prokaryotes are - blue-green algae. 
  • Question 3
    1 / -0
    Which of these is not related to endoplasmic reticulum?
    Solution
    Endoplasmic reticulum (ER) exists as a membranous network enclosing a fluid-filled lumen which almost fills up the intracellular cavity. The network of the endoplasmic reticulum is present all over the cell. The endoplasmic reticulum is connected to the nuclear envelope. So, it behaves as transport channel for proteins between nucleus and cytoplasm. The ER facilities transport of materials from one part of the cell to another, thus forming the cell's circulatory system. Mitochondria is the site of energy generation. It is not generated in the endoplasmic reticulum.
    So, the correct answer is option C.
  • Question 4
    1 / -0
    Centriole is associated with
    Solution
    Centrosome is the region present adjacent to the nucleus and in the cytoplasm which contain centrioles. Centrioles are cylindrical organelles that help in cell division in animal cells. During cell division, centrioles migrate to the poles of animal cells and are involved in the formation of the spindle fibres. Spindle fibres attach to sister chromatids from both sides and pull one sister chromatid at each pole. This way, chromosomal material is divided equally for the formation of two daughter cells. 
  • Question 5
    1 / -0
    The organelle that helps in the membrane biogenesis is?
  • Question 6
    1 / -0
    The network of endoplasmic reticulum is present in the
    Solution
    Endoplasmic reticulum is a tube like structure present in the cell, which extends all over the cell. The network of endoplasmic reticulum is present in the cytoplasm. Endoplasmic reticulum (ER) exists as a membranous network enclosing a fluid-filled lumen which almost fills up the intracellular cavity. 
  • Question 7
    1 / -0
    Cell wall of which one of these is not made up of cellulose?
    Solution
    Hydrilla plant shows the presence of cellulosic cell wall surrounding its cell membrane.  
    Mango tree is an angiosperm plant. It shows the presence of thick cellulosic cell wall.   
    Cactus is a xerophytic plant. It shows the presence of thick, cellulosic cell wall. Cell wall prevents the loss of water from plant body. 
    Bacteria show cell wall around its cell membrane. The bacterial cell wall is made up of peptidoglycan. 
    Hence the correct option is A.
  • Question 8
    1 / -0
    The organelle which lacks double membrane is
    Solution
    Mitochondria are double membrane organelles. 
    Chloroplast possesses double membrane as its covering.
    Nucleus is enclosed by a double membranous sheath. 
    Lysosomes is a small vesicle surrounded by a single membrane. Lysosomal membrane allows the digestive enzymes to work at lower pH. It also protects the cytosol from digestive enzymes.
    So, the correct answer is option D.

  • Question 9
    1 / -0
    Name two semi-autonomous organelles.
    Solution
    Both mitochondria and plastids contain DNA as well as ribosomes and are able to synthesise some of its own proteins. But, since they depend on the nuclear gene for biogenesis and on ground cytoplasm for biosynthetic activities, they cannot exist independently. Hence, they are called as semiautonomous organelles. 
  • Question 10
    1 / -0
    ______ controls all the activities of the cell.
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