Multiple Answer 1 point Which of the following apply best to the specific/adaptive immune system? (Choose all correct answers.) produce immunological memory external barriers, skin, mucous membranes inflammation only fights against one specific pathogen local effect systemic effect
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Adaptive immunity is also known as antigen-specific immunity and includes the components of the immune system that produce allergic responses. It is the acquired ability to recognize and destroy a particular pathogen or its product through previous exposure to that pathogen or its products. Choose the correct words to complete the descriptions of the components of the adaptive immune response. 1. Mast cells undergo degranulation to release their contents, which cause inflammation. 2. Plasma cells develop from certain B cells (not all) and secrete antibodies. 3. T cell receptors bind antigen, but only when it is presented by a structure on another cell. 4. Class I MHC presents peptides to T cells and is only found on specific types of nucleated cells. 5. APCs include B cells, dendritic cells, and macrophages. 6. Igs are released by plasma B cells and interact with antigens. 7. Class II MHC presents peptides to T cells and is found on the membranes of all nucleated cells.
Adi S.
Question 2 (1.5 points) Which of the following best describes the innate nonspecific immune system? 1) a targeted and highly specific response to a single pathogen or molecule 2) a generalized and nonspecific set of defenses against a class or group of pathogens 3) a set of barrier mechanisms that adapts to specific pathogens after repeated exposure 4) the production of antibody molecules against pathogens Question 3 (1.5 points) Which of the following is true about innate immunity functions? 1) Results in memory 2) Requires PRR/TLR recognition to PAMPS 3) Develops over lifetime 4) Resistance to infection depends on previous exposure to pathogen Question 4 (1.5 points) If successful, a covid 19 party will result in what type of immunity? 1) active artificially acquired 2) active naturally acquired 3) passive artificially acquired 4) passive naturally acquired Question 5 (1.5 points) Mechanism of coating antigen with antibody to enhance phagocytosis: 1) Agglutination 2) Opsonization 3) Neutralization 4) Inflammation
Suman K.
Which scenario can lead to an autoimmune disease? - Foreign antigens resemble self-antigens. - New self-antigens appear due to mutations. - Self-reactive T or B cells are not destroyed and they escape into the body. - Hapten attachment can create new self-antigens. - All of the above are correct. Lymph nodes: - Filter the lymph by removing and destroying microorganisms and other debris. - Speed up the flow of lymph through the system. - Secrete hormones that cause T cells to become immunocompetent. - Remove old or damaged red blood cells from circulation and store iron. - All of the above are correct. Cytotoxic T cells: - Are killer T cells; they kill virus-infected and cancer cells (CD8 or killer T cells). - None of the above are correct. Which statement regarding lymphocytes is correct? - B cells become immunocompetent in the bone marrow. - T cells that strongly attack self-antigens are positively selected. - Antigen-presenting cells in the thymus are important for T cell selection. - T cells become immunocompetent in the thymus.
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