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Cell The Unit of Life Test - 64

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Cell The Unit of Life Test - 64
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  • Question 1
    1 / -0
    Orange-yellow colours of flowers and fruits are due to
    Solution
    • Chromoplasts are specialized plastids which contain coloured pigments such as carotene, xanthophylls etc.
    • They are found in fruits, flowers, roots and ageing leaves.
    • They impart distinct colours to these plant parts.
    • Orange-yellow colours of flowers and fruits are due to xanthophyll pigment present in the chromoplasts.
    • So, the correct answer is 'Chromoplasts'.
  • Question 2
    1 / -0
    Out of peroxisomes, lysosomes and mitochondria, single membrane covering occurs in
    Solution
    • A lysosome is a single membrane-bound organelle which contains digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
    • The peroxisome is a single membrane-bound organelle which contains oxidative enzymes and is responsible for lipid production and oxidation reactions within the cell.
    • Whereas, mitochondria is a double membrane-bound organelle and is known as the powerhouse of the cell which is present in all eukaryotic cells.
    • So, the correct answer is 'Both peroxisomes and lysosomes'.
  • Question 3
    1 / -0
    Ribosome is often called
    Solution
    • Ribosomes are known as protein factories because they are the main site of protein synthesis. 
    • It consists of two subunits and each subunit is made up one or more of ribosomal RNA molecules and ribosomal proteins.
    • Therefore, they are also known as RNA particle.
    • So, the correct answer is 'RNA particle'.
  • Question 4
    1 / -0
    Which is incorrect in relation to lysosome?
    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.
    • Lysosomes are known as polymorphic cellular organelles (they exist in more than one form).
    • A lysosome is autophagic in nature (the cytoplasmic material and organelles are degraded by lysosomes).
    • So, the correct answer is 'They are monomorphic'.
  • Question 5
    1 / -0
    Lysosome enzymes are active at pH
    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.
    • The pH of the interior of lysosome ranges from 4.5 - 5 (acidic in nature).
    • All the enzymes of the lysosome are acid hydrolases and are active at the acidic pH (pH= 5) which is maintained within lysosomes.
    • So, the correct answer is '5'.
  • Question 6
    1 / -0
    Function of lysosome is
    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 'Breakdown of cell substances'.
  • Question 7
    1 / -0
    Which statement is not correct with reference to mitochondria?
    Solution
    Mitochondria are cell organelles of aerobic eukaryotes which take part in oxidative phosphorylation and Krebs' cycle of aerobic respiration. 
    They are double membrane structure where the inner membrane is thrown in various types of fold called cristae. 
    The cristae increase the surface area for absorption and also increases the efficiency of the mitochondria.
  • Question 8
    1 / -0
    Nucleoplasm is also called
    Solution
    • Nucleoplasm refers to the soluble materials present within the nucleus that is enclosed by the nuclear envelope.
    • It is made up of enzymatic proteins (for replication of DNA and transcription RNA), ribonucleoproteins, enzymes, ions etc.
    • It is also known as karyolymph or nuclear sap.
    • So, the correct answer is 'Both A and B'.
  • Question 9
    1 / -0
    Ribosomes take part in protein synthesis 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.
    • Both prokaryotic and eukaryotic cells have ribosomes.
    • In prokaryotes, the ribosome present is 70S type whereas eukaryotes have both 70S ribosome (mitochondria and chloroplast) and 80S ribosome (nucleus).
    • So, the correct answer is Both prokaryotes and eukaryotes'.
  • Question 10
    1 / -0
    Besides proteins, ribosomes contain
    Solution
    • Ribosomes are known as protein factories because they are the main site of protein synthesis. 
    • They are present in the cytoplasm of the cell. the matrix of mitochondria, on the membrane of rough endoplasmic reticulum etc.
    • They play an important role in the synthesis of proteins.
    • It is made up of two subunits-
    1. Large subunits- join amino acids to form a polypeptide chain.
    2. Small subunits- reads RNA.
    • The subunit consists of ribosomal RNA and ribosomal proteins.
    So, the correct answer is 'RNA'.
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