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Review of Cytotoxic vs Helper T Cells quiz

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  • What CD marker is found on cytotoxic T cells?
    Cytotoxic T cells have a CD8 marker on their surface.
  • What CD marker is found on helper T cells?
    Helper T cells have a CD4 marker on their surface.
  • Which MHC class do cytotoxic T cells recognize antigens on?
    Cytotoxic T cells recognize antigens presented on MHC Class I molecules.
  • Which MHC class do helper T cells recognize antigens on?
    Helper T cells recognize antigens presented on MHC Class II molecules.
  • Where are MHC Class I molecules found?
    MHC Class I molecules are found on all nucleated cells.
  • Where are MHC Class II molecules found?
    MHC Class II molecules are found only on antigen presenting cells such as dendritic cells, macrophages, and B cells.
  • What type of antigens do MHC Class I molecules present?
    MHC Class I molecules present endogenous antigens, which originate inside the target cell.
  • What type of antigens do MHC Class II molecules present?
    MHC Class II molecules present exogenous antigens, which originate outside the target cell.
  • What is the main function of cytotoxic T cells?
    Cytotoxic T cells induce apoptosis in infected host cells to eliminate intracellular pathogens.
  • What is the main function of helper T cells?
    Helper T cells activate or stimulate target cells, such as B cells and macrophages, to improve their immune capabilities.
  • What happens when T lymphocytes encounter harmless antigens?
    T lymphocytes are not activated by harmless antigens and remain unresponsive, not generating an immune response.
  • What triggers the activation of T lymphocytes?
    T lymphocytes are activated when harmful antigens are presented, leading to an immune response to eliminate the threat.
  • How do CD4 cells contribute to the immune response?
    CD4 cells can activate macrophages and B cells to generate an effective immune response.
  • Why can cytotoxic T cells target almost all cells in the body?
    Because MHC Class I molecules are present on all nucleated cells, cytotoxic T cells can target nearly all cells.
  • What potential downside of the immune system is mentioned in the lesson?
    Sometimes the immune system can cause unintentional harm to our own tissues, which will be discussed further in the course.