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Cell The Unit of Life Test - 48

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Cell The Unit of Life Test - 48
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  • Question 1
    1 / -0
    The key difference in the animal and plant cells is:
    Solution
    The following table illustrates the difference between the structures of a plant cell and an animal cell.

     Animal cells Plant cells
     Cell wall absent Cell wall present
     Chloroplast absent  Chloroplast present
     Vacuoles are small                                  Vacuoles are large, sap-filled in plant cells
    As evident, the key distinguishing feature is the presence of a cell wall in a plant cell while it is absent in an animal cell.
    Therefore, the correct answer is option A.
  • Question 2
    1 / -0
    Which of the following is a membrane-bound organelle found only in eukaryotic cells and houses the cell's genetic material?
    Solution
    A nucleus is a membrane-bound organelle found in eukaryotic cells. It is enveloped by a double membrane called the nuclear membrane. It contains the cell's genetic material or chromosomes. Pores in the nuclear membrane allow for the passage of molecules in and out of the nucleus. 
    Thus, the correct answer is option A.
  • Question 3
    1 / -0
    What is endoplasmic reticulum?
    Solution
    • The endoplasmic reticulum is a large network of membrane-bound tubes. The flattened membrane-enclosed sacs or tube-like structures of the endoplasmic reticulum is known as cisternae. 
    • The endoplasm is the inner core of the cytoplasm and the membranes of the ER are continuous with the outer nuclear membrane.

      Hence, option D is correct.
  • Question 4
    1 / -0
    The locomotion of prokaryotes is due to 
    Solution
    A flagellum (plural- flagella), is a long tube like extended part of the bacterial body and acts like appendage for locomotion. The flagella of prokaryotes are quite different structurally from those of eukaryotes. Prokaryotic flagella consist of tightly wound chains of the protein flagellin attached to a molecular motor complex located within the cell wall.
    So, the correct answer is option A.
  • Question 5
    1 / -0
    Undefined nuclear region of a prokaryotic cell containing only nucleic acids is called as a _______
    Solution
    The nucleoid (meaning nucleus-like) is an irregularly shaped region within the cell of a prokaryote that contains all or most of the genetic material. In contrast to the nucleus of a eukaryotic cell, it is not surrounded by a nuclear membrane. In organisms like bacteria the nuclear region of cell may be poorly defined due to absence of a nuclear membrane. 
    Hence the correct option is A.
  • Question 6
    1 / -0
    Ribosomes are site of 
    Solution
    Ribosomes on the rough endoplasmic reticulum are called as 'membrane-bound' and are responsible for the assembly of many proteins. This process is called as translation. Certain cells of the pancreas and digestive tract produce a high volume of protein as enzymes. Many of the proteins are produced in quantity in the cells of the pancreas and the digestive tract and function as digestive enzymes.
    Thus, the correct answer is 'Protein synthesis'.
  • Question 7
    1 / -0
    Select the most appropriate option.

    Eukaryotic cells have a dense double membrane-bound structure inside, called:
    Solution
    A eukaryotic cell has a nucleus bounded by a double-walled membrane structure known as a nuclear membrane. The nucleus contains the chromatin threads and the nucleolus. The gel-like texture of the nucleoplasm embedded with chromatin threads gives it a dense appearance.
    Hence the correct option is A.
  • Question 8
    1 / -0
    The nucleus has a double layered covering called as:
    Solution
    A eukaryotic cell has a nucleus bounded by a double wall membrane structure known as a nuclear membrane. The nuclear membrane is a discontinuous membrane having nuclear pores, which act as a protein channel for regulating the exchange of materials between cytoplasm and nucleoplasm. The gap between the inner and outer membrane is known as perinuclear space.
    Hence the correct option is C.
  • Question 9
    1 / -0
    Which of the following is correct for prokaryotic cell?
    Solution
    Prokaryotic cells are primitive cells, which are simple in structural organization. These are smaller in size than the eukaryotic cell. These are unicellular in structure, where the organisms lack the division of labor and they are not specialized;  a single cell performs all the metabolic functions. They lack true nucleus and undergo rapid division by asexual means.
    Hence the correct option is D.
  • Question 10
    1 / -0
    Prokaryotes reproduce by 
    Solution
    The prokaryotes mostly reproduce by asexual reproduction. The prokaryotic cell, are unable to form gametes because they do not undergo meiosis rather mitosis takes place in the prokaryotes during asexual reproduction. These cells divide by the process like budding, fragmentation which are the types of asexual reproduction.
    So, the correct answer is option B.
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