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Cell The Unit of Life Test - 60

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Cell The Unit of Life Test - 60
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  • Question 1
    1 / -0
    Membrane thickness of E.R. is
    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 endoplasmic reticulum is enclosed by the unit membrane.
    • The cisternae, vesicles and tubules of the endoplasmic reticulum are enclosed by a membrane with a thickness of 50- 60Aº.
    • So, the correct answer is '50- 60 Aº'.
  • Question 2
    1 / -0
    Function of R.E.R. is
    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 factory of a cell is known as rough endoplasmic reticulum (studded with ribosomes).
    • The RER along with the ribosomes manufacture proteins and transport them to other parts of the cell (protein synthesis)
    • So, the correct answer is 'Protein synthesis'.
  • Question 3
    1 / -0
    A membrane-lined system of channels present throughout the cytoplasm is
    Solution
    • A membrane-lined system of channels present throughout the cytoplasm is endoplasmic reticulum.
    • 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.
    • It forms a continuous network with the nuclear membrane.
    • It helps in the synthesis of proteins (rough). lipids and carbohydrates (smooth) etc.
    • So, the correct answer is 'Endoplasmic reticulum'.
  • Question 4
    1 / -0
    Membrane system considered to be extension of infolded plasma membrane is
    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.
    • It forms a continuous membrane system with the nuclear membrane which are the extensions of the infolded plasma membrane.
    • So, the correct answer is 'Endoplasmic reticulum'.
  • Question 5
    1 / -0
    Eukaryotic cells devoid of E.R. are
    Solution
    • The red blood cells in humans lack nucleus, mitochondria and endoplasmic reticulum which allows them to have a biconcave shape that helps in diffusion.
    • The absence of mitochondria and endoplasmic reticulum allows the RBCs to have more haemoglobin which helps to carry more oxygen molecules.
    • Therefore. the RBCs do not divide or replicate like normal cells of the body.
    • So, the correct answer is 'Mature erythrocytes'.
  • Question 6
    1 / -0
    The term endoplasmic reticulum was coined 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.
    • It was first observed in the year 1897 by Garnier (named ergastoplasm) using the light microscope.
    • The term endoplasmic reticulum was coined by Keith R. Porter in the year 1945.
    • So, the correct answer is 'Porter'.
  • Question 7
    1 / -0
    The organelle ribosome resembles ______________.
    Solution
    A ribosome is an organelle made up of rRNA and protein. In eukaryotes, a ribosome plays a major role in the production of protein from amino acids during translation. Cytoribosomes also called cytoplasmic ribosome is the organelle in prokaryotes that resembles ribosomes in eukaryotes. 
    Thus the correct answer is option B. 
  • Question 8
    1 / -0
    Pollutants, toxins and carcinogens are detoxified by
    Solution
    • The smooth endoplasmic reticulum contains enzymes which catalyze a series of reactions that detoxifies lipid-soluble drugs, toxins and other harmful metabolic substances produced.
    • Cytochrome (proteins with heme as a cofactor) P450 and P448 contains enzymes which help in the removal of carcinogenic compounds from the body.
    • So, the correct answer is 'Both A and B'.
  • Question 9
    1 / -0
    Organelle ribosomes occur 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 are present in the cytoplasm of the cell. chloroplasts or plastids, in the matrix of mitochondria, on the membrane of rough endoplasmic reticulum etc.
    • So, the correct answer is 'Plastids and Mitochondria'.
  • Question 10
    1 / -0
    Palade granules are
    Solution
    • Ribosomes were earlier known as palade particles or granules.
    • George E. Palade discovered the palade particles in the year 1955 and described them as small particles present in the cytoplasm which are associated with the membrane of the endoplasmic reticulum.
    • So, the correct answer is 'Ribosomes'.
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