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Cell The Unit of Life Test - 19

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Cell The Unit of Life Test - 19
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  • Question 1
    1 / -0
    ............. conducts cell autolysis.
    Solution
    Autophagic vacuoles are a type of lysosomes. They perform autophagy or autolysis of degenerate and useless parts in animals. They play a major role in animal metamorphosis in digesting away the larval organs. 
    Thus, the correct answer is option D.
  • Question 2
    1 / -0
    Mitochondrial matrix contains
    Solution
    The space within the inner membrane of mitochondria is called as a matrix. It possesses their own DNA, RNA and ribosomes. It shows the presence of many enzymes required for ATP production. Thus, the correct answer is option D.
  • Question 3
    1 / -0
    Which one of the following provides mechanical support to cell?
    Solution
    The endoplasmic reticulum is a tube-like structure present in the cell, which extends all over the cell. The Endoplasmic Reticulum facilities transport of materials from one part of the cell to another, thus forming the cell's circulatory system. It has the fluid-filled lumen which almost fills up the intracellular cavity. Hence, ER is involved in providing shape and mechanical support to colloidal cytoplasmic matrix and forming the ultra structural skeletal framework. Therefore, option D is correct. 
  • Question 4
    1 / -0
    Which one of the following is not a part of nucleus?
    Solution
    Centrosome is a small body located near the nucleus. It has a dense center and radiating tubules. During cell division (mitosis), the centrosome divides and the two parts move to opposite sides of the dividing cell and produce microtubules.
    Hence the correct option is C.
  • Question 5
    1 / -0
    The smooth endoplasmic reticulum helps in manufacture of 
    Solution
    Smooth ER (endoplasmic reticulum) is tubular in the structure which doesn't have ribosomes on its surface.  Smooth ER is involved in the manufacture of lipids and its metabolism. It also helps in the production of steroid hormones in the adrenal cortex and endocrine glands. So, the correct answer is option C.
  • Question 6
    1 / -0
    Proteins that are to be used outside the cell are synthesised
    Solution
    Ribosomes are the factories of protein synthesis, which remain associated with rough ER. Rough endoplasmic reticulum, is called so due to the appearance of this organelle in electron micrographs. The roughness results from ribosomes, which are studded on the membranes of the organelle. The major function of rough ER is to make proteins that are secreted by the cell. An example of such a secretory protein is an antibody, a defensive molecule made and secreted by white blood cells. Ribosomes of the rough ER synthesise the antibody's polypeptides, which assemble into functional proteins inside the ER.
    Therefore, the correct answer is option B.
  • Question 7
    1 / -0
    Which of the following organisms are prokaryotes?
    Solution
    Archaea bacteria and eubacteria are prokaryotes. They have a disorganized nucleus and they are devoid of membrane-bounded organelles. Fungi is a eukaryote.
    So, the correct answer is option D.
  • Question 8
    1 / -0
    The powerhouse of a cell is
    Solution
    Mitochondria is called as a powerhouse of the cell because it produces and stores energy in the form of ATP. Mitochondria take nutrients and convert them into energy molecules. This process is known as 'oxidative phosphorylation'. 
    So, the correct option is B.

  • Question 9
    1 / -0
    The inner mitochondrial membrane is compartmentalized into numerous 
    Solution
    The inner mitochondrial membrane is folded into finger-like projections known as cristae, which increases the surface area for cellular respiration to produce more energy in the form of ATP.
  • Question 10
    1 / -0
    Membrane bound organelles are .......... in prokaryotes.
    Solution
    Prokaryotes are unicellular, primitive organisms. They do not possess membrane-bound organelles and a well-defined nucleus.
    Thus, the correct answer is option A. 
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