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Total Questions : 43 | Page 5 of 5 pages
Question 41. . Infants are most susceptible to bacterial infection due to low circulating levels of IgG
  1.    in utero (before birth)
  2.    at 0-3 months of age
  3.    at 3-12 months of age
  4.    at 12-24 months of age
 Discuss Question
Answer: Option C. -> at 3-12 months of age
Question 42. . DiGeorge's syndrome is characterized by the lack of a thymus The mouse model closest to this human disease would be a
  1.    knock-out mouse for RAG-1 and RAG-2
  2.    knock-out mouse for a thymus
  3.    nude mouse
  4.    recombinant mouse for CD3
 Discuss Question
Answer: Option C. -> nude mouse
Question 43. . The chemical, typically released by the body in an allergic response is
  1.    histamine
  2.    allergens
  3.    antihistamines
  4.    perforins
 Discuss Question
Answer: Option A. -> histamine

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