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Cell The Unit of Life Test - 46

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Cell The Unit of Life Test - 46
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  • Question 1
    1 / -0
    The only cell organelle seen in prokaryotic cell is
    Solution
    Prokaryotes are organisms without a distinct cell nucleus or any other membrane-bound organelles. Most are unicellular, but some prokaryotes are multicellular. The ribosome is the only organelle found in prokaryotic cell and it functions in the translation of messenger RNA into proteins.
    Hence the correct option is C.
  • Question 2
    1 / -0
    The fingers of a human embryo are at first webbed but later free from one another. Which organelle helps in this?
    Solution
    D. Lysosome
    Reason : Lysosome, a single membrane bound organelle, is a sac like structure which contains digestive enzymes. It is also known as the 'suicidal bag of the cell. It secrets enzymes that destroys the cells of webbed fingers of human embryo and make them free. 
    So the correct option is D.
  • Question 3
    1 / -0
    Prokaryotic cell is one, which does not have _________________
    Solution
    Prokaryotic cells are the primitive cells that lack the membrane-bound organelle and nucleus. They are the smallest types of cells, averaging 2-5 µm in length, which makes them just visible under the light microscope. Genetic information in prokaryotic cells is carried on a single circular piece of DNA that is attached to the cell membrane and in direct contact with the cytoplasm known as a nucleoid. 
    Hence the correct option is A.
  • Question 4
    1 / -0
    Disappearance of tadpole tail during metamorphosis is brought about by 
    Solution
    The role of lysosome has been discovered in the metamorphosis of the frog. The disappearance of the tail from the tadpole larva of frog is due to lysosomal activity. The lysosomes contain an enzyme, cathepsin, which degrades the polypeptides in the tail leading to its disappearance.
    So, the correct answer is option A.
  • Question 5
    1 / -0
    Sarcosomes are the
    Solution
    Sarcosome is a large specialised mitochondrion found in the striated muscle which generates energy during muscle contraction. It is mainly present in the sarcomere of muscles. It helps in the binding of the contractile protein.
    So, the correct answer is option D.
  • Question 6
    1 / -0
    The structure that helps locomotion in prokaryotic cell is
    Solution
    Flagella is the organ of locomotion in bacteria. They are made up of the protein flagellin and helical in shape. The flagellum rotates in a clockwise or counterclockwise manner like a propeller facilitating locomotion.
    Pseudopodia, also called false feet are temporary extensions of the cytoplasm-filled cell membrane used in locomotion and feeding. 
    Thus the correct answer is option D.
  • Question 7
    1 / -0
    The antimicrobial enzyme is
    Solution
    Lysozyme is an antimicrobial enzyme. It is mostly found in birds, mammals, plants, insects, and bacteria. Lysozyme can be traced in body fluids like tears, saliva, sweat and other mucosal linings, such as the nasal cavity. It provides innate immunity to the organism.
  • Question 8
    1 / -0
    Mitochondria are the seat of 
    Solution
    The mitochondria is the seat of respiration as it produces energy in the form of ATP by the oxidation process such as Krebs' cycle. It occurs in the mitochondrial matrix in which pyruvate from glycolysis oxidize and produces ATP and hence, they are called as a power house of the cell.
  • Question 9
    1 / -0
    Organelle which plays an important role in detoxification of drugs and toxins is
    Solution
    Smooth endoplasmic reticulum in liver cells of vertebrates helps in detoxifying poisons and drugs. It contains enzymes that catalyze a number of reactions that can make lipid-soluble drugs and metabolic wastes into water-soluble so that these can easily be expelled out from the body. To perform such processes SER increases or doubles its surface area so lots of detoxification can take place.
  • Question 10
    1 / -0
    The movement of cilia and flagella is brought about by
    Solution
    Cilia and flagella are the extended parts of the cell and act like locomotory appendages. The motion of cilia and flagella is created by the microtubules sliding past one another. This requires motor molecules of dynein, which link adjacent microtubules together and ATP.
    Hence the correct option is A.
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