FREE LST Antigen Questions and Answers
What is the role of T cell receptors (TCRs) in antigen recognition?
T cell receptors (TCRs) on T cells recognize and bind to antigens presented by MHC molecules on the surface of antigen-presenting cells.
How do cytotoxic T cells kill infected cells?
Cytotoxic T cells kill infected cells by secreting perforin and granzymes, which induce apoptosis in the target cells.
Which cells are considered professional antigen-presenting cells (APCs)?
Dendritic cells, macrophages, and B cells are professional antigen-presenting cells that process and present antigens to T cells.
Which type of MHC molecule presents endogenous antigens to CD8+ T cells?
MHC class I molecules present endogenous antigens (from within the cell) to CD8+ cytotoxic T cells.
What cytokine is essential for the proliferation of activated T cells?
Interleukin-2 (IL-2) is a cytokine that is crucial for the proliferation and survival of activated T cells.
What is clonal expansion in the context of lymphocyte activation?
Clonal expansion is the process by which lymphocytes that have recognized a specific antigen rapidly proliferate to mount an effective immune response.
What molecule on the surface of B cells is responsible for antigen recognition?
The B cell receptor (BCR) on the surface of B cells binds to specific antigens, initiating the immune response.
What type of antigens do MHC class II molecules present?
MHC class II molecules present exogenous antigens (from outside the cell) to CD4+ helper T cells.
What is the initial event in the lymphocyte activation process?
The initial event in lymphocyte activation is the recognition of an antigen by a specific receptor on the lymphocyte.
What is the primary function of lymphocytes in the immune system?
Lymphocytes are a type of white blood cell that plays a critical role in the immune response by fighting infections and providing immunity.
What are the main types of lymphocytes involved in antigen recognition?
T cells and B cells are the primary lymphocytes involved in antigen recognition and immune response.