8. In an adaptive immune response a dendritic cella. Binds to an accessory protein or cytotoxic T cells to activate their production of perforinb. Destroys antibody-labeled cells by phagocytosisc. Activates humoral and cell-mediated immunity by releasing interferons after engulfing avirusd. Presents peptide antigens of an engulfed pathogen in its class II MHC molecules to helperT cells, and releases cytokines
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1. Dendritic cells present antigen to (choose all that apply) a. B cells b. Helper T cells c. Cytotoxic T cells d. Other dendritic cells e. Macrophages 2. Helper T cells (choose all that apply) a. Proliferate and differentiate after binding antigen presented by a dendritic cell b. Induce apoptosis in infected host cells c. Can stimulate Cytotoxic T cells d. Can activate macrophages e. Can activate B cells f. Can produce antibodies
Prashant B.
T cells are stimulated by the binding of antigen-MHC complex to the T cells' receptors. The outcome of this interaction (i.e., whether it leads to formation of antibodies or to the death of the cell with the antigen-MHC complex) depends on a. which class of MHC protein is involved. b. which type of T cell is involved. c. whether perforin is produced. d. All of the above e. None of the above Which immune protein(s) below is/are correctly described? Select all that apply: a. Antibodies: bind to specific epitopes, or molecular patterns, present on antigens. Antibodies comprise the B cell receptor. Secreted antibodies produced by plasma cells enable opsonization and agglutination b. Major histocompatibility complex (MHC): MHC II is present on professional antigen presenting cells (APCs) and present antigens to the T cell receptor (TCR) of T helper cells. MHC I is present on most nucleated cells and can present self-antigens as well as internal pathogen antigens to the T cell receptor. c. T cell receptor (TCR): membrane receptors on T cells that enable these lymphocytes to bind to epitopes presented by MHC molecules. Involved in the activation of T cells. d. Complement: innate immune system protein. Cascade of activation that enables the binding to invading microorganisms and promotes opsonization (phagocytosis) by phagocytic cells. e. Cytokines: small signaling proteins produced by various cell types. Involved in the activation and proliferation of B and T lymphocytes
Md.Daniyal A.
An antigen-presenting cell: a. can be a CD8 $^{+}$ T cell. b. derives from a phagocytic cell and exposes an antigen to a lymphocyte. c. secretes antibodies. d. cannot be a B cell. e. cannot stimulate helper T cells.
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