Which of the following statements about T lymphocytes is FALSE? T lymphocytes are called such because they mature in the thymus. There are three types of T lymphocytes. T lymphocytes produce antibody molecules. T lymphocytes have TCRs that recognize antigen only if it is bound to MHC. T lymphocytes directly attack cells and produce the cell-mediated immune response.
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Which one of the following statements about T cells involved in an immune response is NOT true? A. Activated T cells receive survival signals from antigens during an infection. B. Activated T cells contribute to the activation of antigen-presenting cells via CD40 ligand. C. Memory T cells generated during a primary immune response express high levels of interleukin-2 receptors and actively proliferate long after the primary response is completed. D. The major effector function of helper T cells is to activate macrophages and other cells by releasing cytokines. E. When an infection is eliminated, activated T cells die by apoptosis.
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Which of the following is NOT true about T cells? Subsequent differentiation of T cells produces cytotoxic T cells, delayed hypersensitivity T cells, helper T cells, and regulatory cells. T cells act in situations where antigens are embedded in cell membranes or are inside host cells and thus are inaccessible to antibodies. T cells develop from lymphoid stem cells in the bone marrow and mature in the thymus. Natural killer cells (NK) are not exclusively differentiated T cells. Which of the following is NOT true about B cells? B cells produce and release antibodies when stimulated. B cells are most effective in defending the body against foreign substances outside of cells, such as bacterial toxins, bacteria, and viruses before they enter cells. Humoral immunity is mediated by B cells and their antibodies. Functional cells are found in all tissues except lymphoid tissues (lymph nodes, spleen, adenoids, and gut-associated tissues).
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Which of the following statements is not true? a. An antibody has more than one antigen-binding site. b. A lymphocyte has receptors for multiple different antigens. c. An antigen can have different epitopes. d. A liver cell makes one class of MHC molecule.
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