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Cell The Unit of Life Test - 62

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Cell The Unit of Life Test - 62
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  • Question 1
    1 / -0
    Which one is lysosomal activity _______________.
  • Question 2
    1 / -0
    Number of proteins associated with 60 S ribosome subunit is 
    Solution
    • The 60S subunit  (80S type in eukaryotes) is made up of 5S RNA with 120 nucleotides, 28S RNA with 4700 nucleotides, 5.8S RNA with 160 nucleotides and 46 proteins.
    • So, the correct answer is '46'.
  • Question 3
    1 / -0
    Pigment free plastids are
    Solution
    • Leucoplast is a colourless plastid (which synthesis monoterpene) and is found in non-pigmented cells.
    • They can also differentiate to form specialized plastids-
    1. Amyloplasts- for storage of starch, 2 Elaioplasts: for storage of fats and 3. Proteinoplasts: for storage of proteins.
        • So, the correct answer is 'Leucoplasts'.
      • Question 4
        1 / -0
        pH of lysosome interior is
        Solution
        • Lysosomes are membrane-bound organelles which contain acid hydrolases or digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
        • The pH of lysosomes ranges from 4.5 - 5 which is slightly acidic compared to the cytosol which has a pH of 7.2.
        • So, the correct answer is '4-5'.
      • Question 5
        1 / -0
        Most abundant organelles of the cell are
        Solution
        • Ribosomes are known as protein factories because they are the main site of protein synthesis. 
        • They are composed of ribonucleic acids and proteins.
        • It is the smallest and most abundantly found cellular organelle.
        • They are found in the cytoplasm, mitochondria and membrane of rough endoplasmic reticulum which helps in protein synthesis.
        • So, the correct answer is 'Ribosomes'.
      • Question 6
        1 / -0
        De Duve discovered lysosomes from ______________.
      • Question 7
        1 / -0
        Chromoplasts are formed from leucoplasts in
        Solution
        • Chromoplast is a plastid which contains coloured pigments and found in certain plant cells which impart bright colour to that part of the plant (flowers, fruits etc.).
        • Chromoplasts containing carotene pigments within them imparts red, orange, or yellow colours to fruit as in tomato, roots as in carrot and petals.
        • Carotene-containing chromoplasts are developed from leucoplasts or chloroplasts.
        • So, the correct answer is 'Carrot'.
      • Question 8
        1 / -0
        The plastid which can form all other types of plastids is 
        Solution
        • Plastids are a pigment containing double membrane-bound organelle which is the site of manufacture and storage of chemical compounds.
        • Plastids are of three types on the basis of the pigments present within them:-
        • 1. chloroplast (green plastid), 2. The chromoplast (coloured plastid) and 3. Leucoplast (colourless plastid).
        • Leucoplasts can differentiate into specialized plastids and are of the following
        1. Amyloplasts stores starch and helps to detect gravity,
        2. Elaioplasts stores fat.
        3. Proteinoplast stores and modifies proteins.
        • So, the correct answer is 'Leucoplast'.
      • Question 9
        1 / -0
        Leucoplasts are present in
        Solution
        • Plastids are a pigment containing double membrane-bound organelle which is the site of manufacture and storage of chemical compounds.
        • Leucoplast is a colourless plastid (which synthesis monoterpene) and are found in non-pigmented cells.
        • They can also differentiate to form specialized plastids-
        1. Amyloplasts- for storage of starch.
        2. Elaioplasts: for storage of fats.
        3. Proteinoplasts: for storage of proteins.
        • So, the correct answer is 'Non pigmented cells'.
      • Question 10
        1 / -0
        Which type of enzyme occurs in lysosome?
        Solution
        • Lysosomes are membrane-bound organelles which are capable of breaking down biomolecules such as proteins, nucleic acids, carbohydrates and lipids.
        • They contain acid hydrolases or digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
        • They can also digest or damage its own cell causing the cell death (autolysis) therefore, they are also known as suicidal bags.
        • So, the correct answer is 'Hydrolase'.
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