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Cell The Unit of Life Test - 31

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Cell The Unit of Life Test - 31
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  • Question 1
    1 / -0
    The rough endoplasmic reticulum owes its rough surface to
    Solution
    Rough endoplasmic reticulum is a type of endoplasmic reticulum, which possesses ribosomes on its surface which makes its surface rough. It involves the formation and transportation of proteins.
  • Question 2
    1 / -0
    ............. is a single membrane organelle.
    Solution
    Mitochondria is a double-membrane organelle involves the formation of energy.
    The nucleus is enclosed by a double membranous sheath and control the cellular activities.
    Plastid possesses double membrane as its covering and involves in the photosynthesis and provide colour to the leaves and fruits.
    Lysosomes are surrounded by a single membrane. The lysosomal membrane allows the digestive enzymes to work at lower pH. It also protects the cytosol from digestive enzymes. Thus, the correct answer is option A.
  • Question 3
    1 / -0
    Which of the following is attached to both karyotheca and plasma membrane?
    Solution
    Endoplasmic reticulum (ER) is a membrane-bound organelle found in all eukaryotic cells except mature erythrocytes. ER is of two type smooth endoplasmic reticulum and rough endoplasmic reticulum. Smooth endoplasmic reticulum is found at the periphery of the cell i.e., towards the plasma membrane and they are devoid of ribosomes. Rough endoplasmic reticulum has rough surface due to the presence of ribosome and they are present towards the nucleus and attached with the karyotheca. Thus, the correct answer is option D.
  • Question 4
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    Smallest cell organelle is-
    Solution
    • The smallest cell organelle present within a cell is ribosome (based on the surface area of the organelle).
    • Ribosomes are known as protein factories because they are the main site of protein synthesis (composed of nucleic acids and proteins).
    • Ribosomes size varies from 20 to 30 nm in diameter.
    So, the correct answer is 'Ribosome'.
  • Question 5
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    Old organelles, viruses, bacteria etc. that a cell can ingests are broken down in-
    Solution
    D. Lysosomes
    Solution : Lysosomes are the structures that are present in the cell that has hydrolytic cells capable of digesting the organelles or bacteria and viruses.
    So the correct answer is " Lysosomes".
  • Question 6
    1 / -0
    Which one of the following is not a feature of prokaryotic cells?
    Solution
    Cyanobacteria are the autotrophic prokaryotes, which carry out oxygenic photosynthesis similar to higher plants. These cells possess chlorophyll-a.
    So, the correct answer is option D.
  • Question 7
    1 / -0
    The respiratory enzymes are stored in bacteria in 
    Solution
    In many bacteria especially gram-positive bacteria, the plasma membrane becomes invaginated and folded to form structures called mesosomes. The mesosomes were formerly thought to be equivalent to mitochondria of eukaryotic cells. They were believed to be the centres of respiratory activity. However it also occurs in the plasma membrane.
    So, the correct answer is option D.
  • Question 8
    1 / -0
    Which of the following is present in a prokaryotic cell?
    Solution
    Bacteria is a prokaryotic cell which does not contain well-developed membrane-bound nucleus. The genetic material of bacteria is present in a central nucleoid which has irregular shape and dispersed in the cytoplasm. The genetic material in nucleoid is called as genophore. The genophore is membrane bound and is also called as prochromosome because it lacks histone proteins and is circular without well-defined ends or telomeres.
    So, the correct answer is option D.
  • Question 9
    1 / -0
    Which of the following statements is/are correct?
    Solution
    • Prokaryotes lack a true nucleus with a well-defined nuclear membrane and other membrane-bound organelles.
    •  They have a simple structural organization. They are unicellular and division of labour is absent.

    So, the correct answer is option B.
  • Question 10
    1 / -0
    Which of the following statement is true regarding ribosomes?
    Solution
    Ribosomes are naked nucleoprotein particles made up of RNA and proteins, and carry out protein synthesis. These are not introns but very important cell organelles. Ribosomes are found in both prokaryotic and eukaryotic organisms. Prokaryotic organisms possess 70S type of ribosomes whereas eukaryotic organisms possess 80S type of ribosomes where S stands for Svedberg unit or sedimentation coefficient. 
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