1) A 14-year-old boy complains of having episodes of sneezing and "runny" nose and generally feeling miserable every August and September

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1) A 14-year-old boy complains of having episodes of sneezing and "runny" nose and generally feeling miserable every August and September. Skin tests are positive for ragweed pollen. This type of hypersensitivity is

A. type I.

B. type II.

C. type III.

D. type IV.

2. An infant does not suffer from any major infectious diseases during the first 6 months of her life. The most likely reason for this is because

A. she is protected by her mother's IgM antibodies.

B. she is protected by her mother's IgG antibodies.

C. her immune system is at its strongest during her first 6 months.

D. her parents have been careful to not expose her to infectious diseases.

3. A 28-year-old woman presents to her physician with a recent history of progressive weakness and a strange facial rash. She is found to have anemia, renal disease, and a positive ANA test. The type(s) of hypersensitivity this most likely represents is/ are

A. type IV.

B. type III.

C. types III and IV.

D. types II, III, and IV.

4. A 36-year-old woman who knows she is allergic to wasp venom is stung by a wasp. Within minutes she develops a severe headache, flushing of her face and neck, and difficult breathing followed by loss of consciousness and shock. This is an example of

A. angioedema.

B. serum sickness.

C. anaphylaxis.

D. autoimmune hemolytic anemia.

5. A 22-year-old man complains of a pruritic, red rash with small blisters underneath his watch band. This immune reaction is most likely mediated by

A. IgG.

B. lymphocytes.

C. IgM.

D. complement.

E. cytotoxic T-cells.

6. A type III hypersensitivity reaction always involves

A. complement.

B. IgM.

C. mast cells.

D. IgE.

7. Which of the following statements about erythroblastosis fetalis is true?

A. The mother is Rh positive.

B. The child is Rh negative.

C. It occurs with the first pregnancy.

D. The child suffers hemolysis of its red blood cells.

8. Which of the following conditions is diagnosed by the cross-matching test?

A. Asthma

B. Transfusion reaction

C. Contact dermatitis

D. Urticaria