Which of the following statements are true regarding compatible blood transfusions? AB individuals can donate blood to O recipients AB individuals can donate blood A recipients B individuals can donate blood O recipients B individuals can donate blood A recipients None of the above are true Several strains of mice are susceptible to helminth infection because they mount the wrong T helper cell response. To protect these susceptible mice from infection with this intracellular bacterium, what cytokines would you give them to promote the correct CD4 T response? IL-12 + IFNγ IL-6 + TGFβ TGFβ IL-4 None of the above Which of the statements are NOT true regarding the function of mast cells? They are found primarily in the blood They metabolize arachidonic acid to make leukotrienes and prostaglandins Mast cells can secrete TNFα They can rapidly release histamine They are activated by antigens Which of the following statements are true regarding lipid mediators (leukotrienes and prostaglandins) released from mast cells? They cause bronchoconstriction. The are required for TNF production They cause intestinal peristalsis. A and C None of the above True or False? Nude mice can develop anaphylactic shock. True False
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Compatible blood transfusions: AB individuals can donate blood to O recipients: False AB individuals can donate blood A recipients: False B individuals can donate blood O recipients: False B individuals can donate blood A recipients: False So, the correct answer Show more…
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Which of the following statements is/are true about T-cell selection and help explain your answer for whether T cells from B mice (the recipient strain) that received bone marrow from K strain donors would, or would not, proliferate in the this assay? these thymocytes develop in an H-2b thymus before selection, thymocytes from these mice produce TCRs specific for only H-2k before selection, thymocytes from these mice produce some TCRs that can interact with H-2k and some that can interact with H-2b MHC before selection some thymocytes from these mice produce TCRs that can interact with other MHC alleles that are not H-2k or H-2b positive selection would only select for thymocytes with TCRs capable of interacting with H-2b MHC MCC is presented as a self-antigen in the thymus of these mice After selection, none of the TCRs in these mice can respond to MCC on H-2b After selection, some of the TCRs in these mice can respond to MCC on H-2b After selection, TCRs in these mice cannot respond to MCC presented on I-Ak After selection, some TCRs in these mice can respond to other antigens presented on I-Ak
Adi S.
Which of the following statements is TRUE of exogenous antigens? A) Exogenous antigens are presented on class I MHC proteins. B) All cells except red blood cells process exogenous antigens. C) Only B cells can recognize exogenous antigens. D) Dendritic cells and macrophages process exogenous antigens. E) Exogenous antigens are produced by cells infected with intracellular pathogens. 70) The thymus is where A) T cells produce their TCR for the first time. B) T cells are produced. C) clonal deletion of T cells takes place. D) T cells produce their TCR for the first time and undergo clonal deletion. E) T cells undergo clonal expansion. 71) Which of the following statements concerning plasma cells is FALSE? A) They are descended from activated B cells. B) They live for many years and function as memory cells. C) The antibodies they produce can remain in circulation for weeks. D) They secrete a single type of antibody molecule specific for a single epitope. E) They can produce large quantities of antibodies on a daily basis. 72) Which of the following statements regarding the cell-mediated immune response is TRUE? A) Helper T lymphocytes have no role in the activation of cytotoxic T lymphocytes. B) Cytotoxic T lymphocytes do not require antigen presentation to become activated. C) A single cytotoxic T lymphocyte can kill many target cells. D) Cytotoxic T lymphocytes kill by producing hydrogen peroxide. E) Cytotoxic T lymphocytes interact with antibodies that have bound antigen to identify their target. 73) The molecular interaction between an antigen presenting cell and a T cell is A) a dendrite. B) an immunological synapse. C) regulatory TCR. D) CD95L. E) clonal expansion. 74) The lymphatic system A) collects fluid from around the brain and spinal cord. B) has a pumping mechanism to move fluid. C) is the site of B and T cell clonal deletion. D) includes areas of high concentrations of APCs, T and B cells. E) is very impermeable to extracellular fluid. 75) Which of the following is the result when a CTL interacts with a virally infected cell? A) The CTL produces oxidizing chemicals. B) The cell produces MHC II with epitope attached. C) The cell releases interferon-gamma (IFN-γ). D) The CTL produces IL-12. E) The cell undergoes apoptosis.
Suman K.
1) Which of these statements is NOT true? a. A person with AB blood can only give blood safely to another person with AB blood. b. A person with blood type O has both A and B antigens. c. A person with blood group O can donate blood to blood types O, AB, A, and B. d. A person with blood group A should not receive blood from blood type AB. 2) Which of the following factors does not influence blood pressure? a. blood type b. stroke volume c. peripheral resistance d. heart rate dehydration 3) Capillary openings are generally smaller in which organ? a. endocrine glands b. small intestine c. skeletal muscle d. kidney 4) Which of the following would decrease the velocity of blood flow overall? a. increased cross-sectional area of blood vessels b. increased blood pressure c. increased heart rate d. increased cardiac output TRUE OR FALSE: In the medullary respiratory center, the dorsal respiratory group establishes the basic rhythm of quiet breathing, while the ventral respiratory group remains inactive.
Madhur L.
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