Reproduction in Single-Celled Organisms Quiz
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Questions and Answers

What is the function of mesosomes in a cell?

  • Cell growth
  • Respiration (correct)
  • Protein production
  • Genetic variation
  • Which organelle is the site of protein production in a cell?

  • Mesosomes
  • Mitochondria
  • Ribosomes (correct)
  • Nucleus
  • Why are all cells produced by mitosis genetically identical?

  • Due to cytokinesis
  • Due to genetic recombination
  • Due to replication of chromosomes (correct)
  • Due to meiosis
  • What is the primary function of mitosis in cell division?

    <p>Producing identical daughter cells</p> Signup and view all the answers

    During which stage of the cell cycle do the chromosomes begin to condense?

    <p>Interphase</p> Signup and view all the answers

    What is the main advantage of organisms using mitosis for growth?

    <p>Growth using identical cells</p> Signup and view all the answers

    What is the process of cell division in prokaryotic cells known as?

    <p>Binary Fission</p> Signup and view all the answers

    During binary fission, what forms between the two DNA molecules to divide the original cell?

    <p>New cell wall</p> Signup and view all the answers

    Which component of the cell/organelle membrane controls the movement of substances in and out?

    <p>Phospholipids</p> Signup and view all the answers

    Why do viruses not undergo cell division?

    <p>They are non-living entities</p> Signup and view all the answers

    What gives the cell membrane its fluid mosaic model structure?

    <p>Phospholipids and proteins arrangement</p> Signup and view all the answers

    In prokaryotic cells, what replicates alongside circular DNA during binary fission?

    <p>Plasmids</p> Signup and view all the answers

    What type of immune response involves T cells and is responsible for destroying pathogen-infected cells?

    <p>Cell-mediated response</p> Signup and view all the answers

    Which cells replicate themselves when exposed to an invading pathogen, leading to a faster immune response upon reinfection?

    <p>Memory cells</p> Signup and view all the answers

    What is the main function of T killer cells in the immune response?

    <p>Destroy pathogen-infected cells</p> Signup and view all the answers

    Which cells produce antibodies in the humoral response?

    <p>Plasma cells</p> Signup and view all the answers

    What is the Y-shaped structure formed by antibodies made of?

    <p>Four polypeptide chains</p> Signup and view all the answers

    Which type of immunity results from the introduction of antibodies from another person or animal?

    <p>Passive immunity</p> Signup and view all the answers

    What is the main function of cholesterol in the cell membrane?

    <p>Make the membrane more rigid and reduce lateral movement of phospholipids</p> Signup and view all the answers

    What is the purpose of maintaining a vacuum environment in an electron microscope?

    <p>To prevent particles in the air from deflecting electrons out of beam alignment</p> Signup and view all the answers

    Which component of the cell membrane allows cells to adhere to one another and form tissues?

    <p>Glycolipids</p> Signup and view all the answers

    What do intrinsic proteins in the cell membrane primarily function as?

    <p>Allow substances to cross the membrane</p> Signup and view all the answers

    In a Transmission Electron Microscope (TEM), how are areas that absorb electrons represented in the images?

    <p>They appear darker on the electron micrograph</p> Signup and view all the answers

    What is a key limitation of Scanning Electron Microscopes (SEM) and Transmission Electron Microscopes (TEM)?

    <p>Living specimens cannot be observed due to the vacuum requirement</p> Signup and view all the answers

    Which type of molecule can easily pass through the cell membrane based on its structure?

    <p>Lipid-soluble molecules</p> Signup and view all the answers

    What is the main purpose of cell fractionation?

    <p>To separate different parts and organelles of a cell for detailed study</p> Signup and view all the answers

    Which component of the cell membrane acts as a cell surface receptor and neurotransmitter?

    <p>Glycoproteins</p> Signup and view all the answers

    Which method is commonly used for cell fractionation?

    <p>Differential centrifugation</p> Signup and view all the answers

    What is the role of glycolipids in the cell membrane?

    <p>Extend from the surface and act as cell surface receptors</p> Signup and view all the answers

    What is the resultant fluid called after cells are blended in an homogeniser during cell fractionation?

    <p>Homogenate</p> Signup and view all the answers

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