MT AAB Immunology| 212 questions with 100% verified correct answers.

Which of the following is not an external defense mechanism of natural immunity that provides the human body with a defense against invading microorganisms? Bursa of Fabricius All of the following are external defense mechanisms of natural immunity that provides the human body with a defense against invading microorganisms Skin, mucus, and body fluids Having an elevated temperature during an infection is an example of what type of immunity? Innate immunity Which defense mechanism involves engulfing foreign particles? Phagocytosis Which one plays an important role in making bacteria susceptible to osmotic lysis? Lysozymes Which one of the following is responsible for the nonspecific killing of tumor cells? Natural killer cells Which one of the following is capable of eliciting an immune response? Immunogen Receiving a vaccination is an example of which type of immunity? Artificial active immunity Which immune response is mediated by antibiotics? Humoral immunity Which one of the following is considered to be a primary lymphoid organ? Thymus Which organs or systems are capable of responding to circulating antigens with the production of specific lymphocytes and plasma cells? Lymph nodes and spleen Where are B lymphocytes and T lymphocytes produced? Bone marrow Which of the following cells are thymus-dependent? T cells Where does the differentiation of T cells occur? Thymus T cells are involved with which of the following? Cell-mediated immunity How can cell-mediated immunity be transferred to a normal individual? With lymphoid cells from a hypersensitive person What is the main function of T helper cells? Assist B cells in producing antibody The production of antibodies is turned off by which cells? Suppressor T cells What are small polypeptides given off by T cells, which regulate the function of phagocytic cells called? Lymphokines Which T cell acts specifically to kill tumor cells and virally infected cells? Cytotoxic T cells All of the following are surface markers for T cells EXCEPT which one? CD 16 All of the following are surface markers for T cells: CD2, CD4, CD8 Lymphoid stem cells that differentiate in the bone marrow are called what? B cells Which one of the following is associated with the humoral immune response? Plasma cells Which cells are identified by the presence of surface immunoglobulin receptor? B cells Which B lymphocytes transform into cells that produce antibody molecules? Plasma cells Which WBCs migrate to the tissue and become macrophages? Monocytes Which one of the following cells ingest and destroy bacteria, damaged host cells, and tumor cells? Macrophages What is the main function of polymorphonuclear WBCs Phagocytosis What is the major histocompatibility complex? The genes that control the expression of the HLA antigens The major histocompatibility complex is important in all of the following: Autoimmune disease associations, organ transplantation, paternity testing The major histocompatibility complex is important in all of the following EXCEPT: Acute hemolytic transfusion reactions Which of the following is not a class I gene product? HLA-DR The following are class I gene products? HLA-A, HLA-B, HLA-C All of the following are class II gene products: HLA-DP, HLA-DQ, and HLA-DR All of the following are class II gene products EXCEPT: HLA:DD Which term describes a macromolecule that is capable of eliciting formation of immunoglobulins? Antigen Which of the following substances is the most potent antigen? Proteins What are the reactive sites on an antigen known as? Determinants What does heterologous antigen react with? An antibody whose production it did not induce