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Cell The Unit of Life Test - 66

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Cell The Unit of Life Test - 66
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  • Question 1
    1 / -0
    Which is not a true organelle?
    Solution
    • A cellular organelle can be defined as a cell component which can carry out its specific function even outside the cell provided it is given the similar environment for survival and functioning as in the cell.
    • Ribosomes are not membrane-bound structures instead they are macromolecules which is made up of ribonucleic acids and proteins.
    • Whereas, Lysosomes, mitochondria and chloroplast are cellular organelles.
    • So, the correct answer is 'Ribosome'.
  • Question 2
    1 / -0
    Select the correct statements.
    (a) Endomembrane system includes plasma membrane, ER, Golgi complex, lysosomes and vacuoles.
    (b) ER helps in transport of substances, synthesis of proteins, lipoproteins and glycogen.
    (c) Ribosomes are involved in protein synthesis.
    (d) Mitochondria help in oxidative phosphorylation and generation of ATP.
    Solution
    a) The endomembrane system includes the nuclear membrane, the endoplasmic reticulum, the Golgi apparatus, lysosomes, vesicles, endosomes and cell membrane.
    b) The endoplasmic reticulum (smooth and rough) is an interconnected network of flattened, membrane-enclosed sacs or tube-like structure which is responsible for the synthesis of lipids and steroid hormones (SER) and proteins (RER).
    c) Ribosomes are known as protein factories because they are the main site of protein synthesis and are composed of ribonucleic acids and proteins.
    d) The mitochondria is a double-membraned cell organelle, known as the powerhouse of the cell and the site of the electron transport chain (aerobic respiration) and oxidative phosphorylation (production of ATP molecules).
    So, the correct answer is 'b, c and d'.
  • Question 3
    1 / -0
    Ergastoplasm is the alternate name of
    Solution
    • Ergastoplasm is the alternate name of the endoplasmic reticulum.
    • The granular endoplasmic reticulum is also known as ergatoplasm.
    • The ER in which ribosomes are found on the cisternae which are involved in the synthesis of proteins and are transported by the membrane-bound vesicles to the extracellular space.
    • So, the correct answer is 'Endoplasmic reticulum'.
  • Question 4
    1 / -0
    Protein storing plastids are called
    Solution
    • Protein storing plastids are called Aleuroplast.
    • The colourless plastid or leucoplast gets differentiated to form alueroplast or proteinoplast.
    • Its main function is to store proteins in plant cells.
    • So the correct answer is 'Aleuroplasts'.
  • Question 5
    1 / -0
    Difference between active and passive modes of membrane transport is
  • Question 6
    1 / -0
    Which of these is wrongly matched?
    Solution
    A. A chloroplast is a plastid which contains a green pigment called chlorophyll which helps in the process of photosynthesis.
    B. Elaioplast is a differentiate leucoplast which stores fat.
    C. Chromoplast is coloured plastids as it contains coloured pigments (carotenoids, xanthophylls etc).
    D. Amyloplast is a differentiated leucoplast which mainly stores starch (carbohydrates).
    E. Aleuroplast is a differentiated leucoplast which stores proteins.
    • So, the correct answer is 'Elaioplasts - starch'.
  • Question 7
    1 / -0
    Which of the following statement is correct?
    Solution
    A. Elaioplast (differentiated leucoplast) stores oil and aleuroplast stores proteins.
    B. An acrocentric chromosome is a  chromosome in which the centromere is located near to one end of the chromosome. 
    C. The core of cilium or flagellum is the axoneme.
    D. Chromatophores are membrane extensions found in phototropic bacteria which contain bacteriochlorophyll pigments and carotenoids.
    So, the correct answer is 'Membranous extensions into the cytoplasm in cyanobacteria which contain pigments are called chromatophores'.
  • Question 8
    1 / -0
    Plastids which store oil are
    Solution
    • Leucoplasts is a colourless plastid that synthesis monoterpene an also get differentiated into more specialized plastids such as amyloplasts, elaioplasts and proteinoplasts etc.
    • Elaioplast is a plastid which stores oils.
    • So, the correct answer is 'Elaioplasts'.
  • Question 9
    1 / -0
    Cellular organelles with membranes are
    Solution
    • Cellular organelles with membranes are Lysosomes, Golgi apparatus and mitochondria.
    • Lysosomes are single 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
    • Golgi apparatus is a single membrane-bound organelle consists of folded and flattened membranes that are involved in secretion and helps in intracellular transport.
    • The mitochondria is a double-membraned cell organelle, known as the powerhouse of the cell which is present in all eukaryotic cells.
    • So, the correct answer is 'Lysosomes, Golgi apparatus and mitochondria'.
  • Question 10
    1 / -0
    GERL system is formed of
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