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Cell The Unit of Life Test - 16

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Cell The Unit of Life Test - 16
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The smallest living cells with cell wall are _______.
    Solution
    Algae are the living cells which, have a cell wall composed of either polysaccharide (such as cellulose (a glucan)) or a variety of glycoproteins. But they are larger in size as compared to the bacterial cell.
    Bacteria is a unicellular prokaryotic organism possess prominent cell wall made up of peptidoglycans.
    Viroids consist solely of short strands of circular, single-stranded RNA without protein coats, it lacks a cell wall.

    Mycoplasma has plasma membrane as the outermost covering, it lacks a cell wall. So, the correct answer is 'Bacteria'.

  • Question 2
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    The prokaryotic cell does not have:
    Solution
    Prokaryotic cells are primitive structures, with the simplest structural organisation. They lack membrane-bounded organelles and have a disorganized nucleus. A prokaryotic cell undergoes asexual mode of reproduction so, the cell division doesn't involve the formation of complex structures like centrioles and spindle fibers.
    So, the correct answer is option D.
  • Question 3
    1 / -0
    The only cell organelle seen in a prokaryotic cell is
    Solution
    Prokaryotes and eukaryotes are two different types of cells. Eukaryotic cells contain membrane-bound organelles, while prokaryotic cells do not. 
    The ribosome is the only organelle that can be seen in both prokaryotic and eukaryotic cells, though the types of ribosomes in the two types of cells vary.
    Hence, the correct option is B.

  • Question 4
    1 / -0
    Oxidative enzymes occurs mostly in
    Solution
    Mitochondria are the organelles which carry out oxidative catabolism, i.e., aerobic oxidation of food and synthesise ATP in the process. This process is called as oxidative phosphorylation. The pyruvate produced in glycolysis is feed in the Kreb's cycle and leads to the production of ATP.
    So, the correct answer is option C.
  • Question 5
    1 / -0
    The mechanical support, enzyme circulation, protein synthesis and detoxification of drugs are function of
    Solution
    Endoskeleton refers to the internal membrane system of a cell. The internal membrane system supports the cells like a skeletal system supports the body of an organism. The endomembrane system comprises of endoplasmic reticulum, Golgi apparatus, lysosome, and plasma membrane. Membranes of ER may bear ribosomes, then ER is called granular or rough endoplasmic reticulum (RER). It is abundant in cells engaged in active secretion and protein synthesis. Endoplasmic reticulum without ribosomes is called as smooth endoplasmic reticulum (SER). SER occurs in cells engaged in producing a lot of lipids. SER also takes part in the synthesis of vitamins, carbohydrates and detoxification. Thus, the correct answer is option A.
  • Question 6
    1 / -0
    Mitochondria is the site for
    Solution
    • Oxidative phosphorylation is phosphorylation carried out during the aerobic respiration process. 
    • Mitochondria is the organelles that carry out oxidative phosphorylation, i.e.,  synthesis of ATP as a result of the transfer of electrons from NADH or FADH$$_2$$ to O$$_2$$ by a series of electron carriers.
    So, the correct answer is option B.
  • Question 7
    1 / -0
    Which of the following cell organelle is considered to be rich in catabolic enzymes?
    Solution
    Mitochondria are the cell organelles responsible for aerobic respiration. Enzymes of Kreb's cycle are present in the matrix of mitochondria. Succinate dehydrogenase is membrane bound and is present on the inner mitochondrial membrane. The electron transport chain is present on the inner mitochondrial membrane. Hence, mitochondria are rich in catabolic enzymes.
  • Question 8
    1 / -0
    Which is concerned with autolysis?
    Solution
    Lysosomes are rich in a variety of hydrolytic enzymes or acid hydrolases.
    Autophagic lysosomes perform autophagy. Autophagy is dependent on hydrolytic enzymes. Lysosomes are important in metamorphosis, i.e., eating away larval organs, removal of obstructions, intracellular scavenging, osteogenesis, fertilization, etc.
    So, the correct answer is 'Lysosomes'
  • Question 9
    1 / -0
    Respiratory enzymes are present in
    Solution
    Mitochondria are called as the power house of the cell because they manufacture energy in the form of ATP in a cell during aerobic respiration. Glycolysis occurs in cytoplasm and converts glucose into two molecules of pyruvic acids. Pyruvic acid molecules are burnt completely inside the mitochondria in Krebs cycle and ATP is produced. The enzymes of Krebs cycle are present in the mitochondrial matrix. However, enzymes of mitochondrial electron transport chain are present on the inner mitochondrial membrane.
  • Question 10
    1 / -0
    Mitochondria are semi autonomous as they possess
    Solution
    Mitochondria is the double membrane-bound oval shaped organelle. It possesses its own self-replicating DNA and protein synthesizing machinery which includes 70S type of ribosomes and RNA. Hence, they are partially autonomous. 
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