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A 3 month old boy who has no detectable t or b cells

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46.A 3-month-old boy who has no detectable T or B cells. This immunodeficiency ismost likely due to a defect in which of the following?1.Improperly formed thymus2.Stem cells originating in the bone marrow3.Lack of proper lymph node structure4.The Peyer’s patch defect5.Loss of splenic macrophages
47.Which of the following is a potential cause for autoimmune disease:
48.A man developed an erythematous and itchy rash around his wrist after wearing abracelet.The lesions faded upon removal of the bracelet and re-appeared severaldays after he started to wear the bracelet again. This time the rash worsened andhe presented with sever blistering.He was diagnosed with contact dermatitis.Which of the following hypersensitivities was most likely involved?
49.Activation of antigen presenting cells turns on their expression of
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50.Which of the following is NOT an antibody effector function:1.CD8 T cell mediated cytotoxicity2.neutralization of bacterial toxins3.complement fixation and bacterial Lysis4.opsonization and phagocytic uptake5.blockade of bacterial adhesion molecules
51.Germinal centers are formed in lymph nodes as a result of the activation of whichtype of cell
52.Myasthenia Gravis is an autoimmune disease where an antibody blocks thetransmission of signals from neurons to muscles. This is a
53.A microbe can cause disease if and only if it can

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