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- Which type of T cell is most effective against viruses? Th1 Th2 cytotoxic T cells regulatory T cellsExplain why each choice (a-d) is correct or incorrect. T cells are differentiated into two groups based on their glycoproteins CD4 or CD8. Which of the following is true of CD4 T cells? a. They become cytotoxic T cells. b. The become antigen presenting cells. c. They become T helper cells. d. They become plasma cells.Homing of effector T cells to inflamed tissue is facilitated by the upregulation of _____ on the surface of the effector T cell. a. VLA-4 b. L-selectin c. CD28 d. VCAM-1 e. B7.
- Which of the following is NOT true about T cells?(a) T cells develop from lymphoid stem cells in the bonemarrow and mature in the thymus.(b) Cell-mediated immunity is primarily carried out by Tcells.(c) Subsequent differentiation of T cells produces cytotoxic(killer) T cells, delayed-hypersensitivity T cells, helper Tcells, and regulatory T cells.(d) Natural killer cells (NK) are exclusively differentiated Tcells.(e) T cells act in situations where antigens are embeddedin cell membranes or are inside host cells and thus areinaccessible to antibodies.Which of the following statements regarding T cells activated by specific antigen is incorrect? a. They receive co-stimulatory signals through CD28. b. They suppress expression of sphingosine 1-phosphate (SIP). c. They take several days before differentiating into effector T cells. d. They cease to secrete and respond to interleukin-2 (IL-2). e. They begin to express CTLA4, which serves to limit T-cell proliferation.Which of the following pairs is mismatched? a. plasma cell: mediation of phagocytosis and killing of microorganisms in the plasma b. megakaryocyte: formation of platelets c. dendritic cell: activation of adaptive immune responses d. natural killer cell: develops from a common lymphoid progenitor e. neutrophil: formation of pus f. regulatory T cell: inhibition of T-cell activity.
- What type of cells secrete antibodies? A) Cytotoxic T cells B) Helper T cells C) B cells D) Plasma cells E) Antigen-presenting cellsHelper T cells do not _________. Select one: a. secrete cytokines that stimulate clonal selection of B cells. b. secrete inflammatory chemicals. c. secrete cytokines that stimulate macrophage activity. d. secrete cytokines that stimulate clonal selection of cytotoxic T cells. e. secrete fever-producing chemicals.CD1-restricted α:β T cells respond to lipid antigens of mycobacterial pathogens using all except which of the following? a. CD1a b. CD1b c. CD1c d. CD1d.
- Which of these statements about T lymphocytes is false? a. Saome T cells promote the activity of B cells. b. Some T cells suppress the activity of B cells. c. Some T cells secrete interferon. d. Some T cells produce antibodies.All of the following are true in reference to T-cell priming except _____. a. it occurs in primary lymphoid organs b. it transforms naive T cells into differentiated effector T cells c. it is the first stage of a primary adaptive immune response d. it requires interaction between naive T cells and antigen-presenting cells e. it takes place in many locations including, but not limited to, lymph nodes, Peyer’s patches, and the tonsils.Activated helper T Cells participate in which of the following processes? a.) Differentiation of memory B cells b.) Activation of cytotoxic T Cells c.) Facilitation of macrophage phagocytosis d.) All of above
