Cell-The Unit of Life


  1. Which one of the following cell organelles is enclosed by a single membrane?










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    Double Membrane bound Organelles: Mitochondria, Chloroplasts, Endoplasmic Reticulum, Golgi Body, and Nucleus. Single Membrane bound Organelles: Lysosomes, Peroxisomes, and Vacuoles. Organelles lacking any membrane: Ribosomes, Centrioles, Nucleolus.

    Correct Option: C

    Double Membrane bound Organelles: Mitochondria, Chloroplasts, Endoplasmic Reticulum, Golgi Body, and Nucleus. Single Membrane bound Organelles: Lysosomes, Peroxisomes, and Vacuoles. Organelles lacking any membrane: Ribosomes, Centrioles, Nucleolus.


  1. Microtubules are the constituents of









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    Microtubules are long, hollow cylinders made up of polymerised a- and b-tubulin dimers. Microtubules are part of a structural network (the cytoskeleton) within the cell’s cytoplasm. Roles of the microtubule cytoskeleton include mechanical support, organization of the cytoplasm, transport, motility and chromosome segregation so they are present in cilia and flagella for cellular movement, centrioles for chromosomal movement and spindle fibres for structural organization as well as chromosomal movement during nuclear division.

    Correct Option: B

    Microtubules are long, hollow cylinders made up of polymerised a- and b-tubulin dimers. Microtubules are part of a structural network (the cytoskeleton) within the cell’s cytoplasm. Roles of the microtubule cytoskeleton include mechanical support, organization of the cytoplasm, transport, motility and chromosome segregation so they are present in cilia and flagella for cellular movement, centrioles for chromosomal movement and spindle fibres for structural organization as well as chromosomal movement during nuclear division.



  1. Mitochondria and chloroplast are
    (a) semi-autonomous organelles
    (b) formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery
    Which one of the following options is correct?









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    Mitochondria & chloroplast are semiautonomous cell organelle which are formed by division of pre-existing organelle & contain DNA but they also contain protein synthesizing machinery, thus (a) is true & (b) is false.

    Correct Option: C

    Mitochondria & chloroplast are semiautonomous cell organelle which are formed by division of pre-existing organelle & contain DNA but they also contain protein synthesizing machinery, thus (a) is true & (b) is false.


  1. Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?









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    The site of aerobic oxidation of carbohydrates in cells to generate ATP are mitochondria.

    Correct Option: C

    The site of aerobic oxidation of carbohydrates in cells to generate ATP are mitochondria.



  1. Which one of the following does not differ in E.coli and Chlamydomonas?









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    Cell membrane of E.coli, a bacteria and Chlamydomonas a unicellular green alga does not differ. As in both cell membrane is composed of lipids and proteins.

    Correct Option: D

    Cell membrane of E.coli, a bacteria and Chlamydomonas a unicellular green alga does not differ. As in both cell membrane is composed of lipids and proteins.