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Cell The Unit of Life Test - 44

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Cell The Unit of Life Test - 44
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which is present in a bacterial cell?
    Solution
    Bacteria are prokaryotes which do not have a well-defined nucleus. Nucleoid is a region in the prokaryotic cell, where its most of the genetic material resides. It is not a well-defined membrane-bound region. Pro-chromosome is present in bacterial cells. DNA of bacteria is referred as 'genophore'. Thus, the correct answer is option D.

  • Question 2
    1 / -0
    Which of the following statements is not correct?
    Solution
    Egg of ostrich is 15 cm long and 13 cm wide. Hence, the egg of an ostrich is the largest animal cell. 
    Mitochondria produces the energy in the form of ATP and called as a powerhouse of the cell.  
    Lysosomes get ruptured and enzymes are released free in damaged cells, ageing cells, dead cells or poorly working cell organelles to digest them. So, they are also known as digestive bags. 
    ATP stands for Adenosine triphosphate, i.e., it contains 3 phosphate groups.
    So, the correct option is C.
  • Question 3
    1 / -0
    Prokaryotic genetic material contains ________________.
    Solution
    Prokaryotic genetic material contains DNA but not Histones. They contain proteins that bind the DNA together called histone analogs.
    So, the correct answer is 'DNA but no Histones'
  • Question 4
    1 / -0
    Centrosome is found only in
    Solution
    Centrosome is the region present adjacent the nucleus and in cytoplasm which contain centrioles. It is present only in animal cells. It is also called as microtubule organising centre of the cell. Centrosome helps in cell division in animal cells. 

  • Question 5
    1 / -0
    The organelle associated with protein synthesis in a cell is
    Solution
    Ribosomes are a cell structure that makes protein. Protein is needed for many cell functions such as repairing damage or directing chemical processes. Ribosomes can be found floating within the cytoplasm or attached to the endoplasmic reticulum.
  • Question 6
    1 / -0
    The capsule is most advantageous to a bacterium because it
    Solution
    The capsule is the protective covering of the bacterial cell made up of polymers of simple sugars (polysaccharides). Most capsules are hydrophilic and may help the bacterium avoid desiccation. It protects a bacterial cell from ingestion and destruction by white blood cells (phagocytosis) and helps it to hide from host immune system. 
    Hence the correct option is A.
  • Question 7
    1 / -0
    All of the following are membrane bound organelles except
    Solution

    Mitochondria are a double membrane organelle. Its inner membrane shows presence of finger-like projections called as cristae. This folded structure increases the surface area for chemical reactions.

    Lysosomes are membrane bound cellular organelles. They possess many hydrolytic enzymes for the digestion of cellular waste, debris as engulfed, killed viruses or bacteria. When cell is in a metabolic crisis then lysosomes digest its own cell or cellular components by releasing enzymes. 

    Sphaerosomes are the lipid bodies, that stores triacylglycerol in the form of oil. They are surrounded by single line membrane. They are responsible for synthesis of cuticle and wax.

    Ribosomes lacks membrane and is involved in protein synthesis.

    So, the correct answer is option C.

  • Question 8
    1 / -0
    The inner membrane of mitochondrion is usually highly convoluted forming a series of in-foldings known as
    Solution
    The inner membrane is freely permeable only to oxygen, carbon dioxide and water. Its structure is highly complex as it folds and forms finger-like projection called as cristae. The cristae greatly increase the total surface area of the inner membrane for the production of energy in the form of ATP.
  • Question 9
    1 / -0
    Bacteria lacks
    Solution
    Bacterial cells are primitive cells hence, called as prokaryotic cells. They do not possess many membrane bound organelles as mitochondria, Golgi complex, etc. 
  • Question 10
    1 / -0
    Ribosomes of bacteria, mitochondria and chloroplasts are
    Solution
    Mitochondria and chloroplasts are thought to have arisen from bacteria, engulfed by primitive cells in a process called as endosymbiosis. Mitochondria probably evolved when cells took up aerobic bacteria, while chloroplasts were derived from photosynthetic bacteria, such as cyanobacteria. Mitochondria and chloroplasts generate energy for their host cells, but are not completely independent. The cytoplasmic ribosomes of prokaryotes are 70S. The cytoplasmic ribosomes of eukaryotes are 80S.
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