Formation of immune complexes between antibodies and soluble antigens is considered to be which type of hypersensitivity reaction?
A. Type I hypersensitivity
B. Type II hypersensitivity
C. Type III hypersensitivity
D. Type IV hypersensitivity
E. All of the above
C
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Which is the most likely reason that HIV-infected people with heterozygous HLA loci have a delayed progression to AIDS compared with patients who are homozygous at one or more HLA loci?
a. The greater number of HLA alleles provides a wider variety of HLA molecules for presenting HIV-derived peptides to CD8 T cells even if HIV mutates during the course of infection. b. Heterozygotes have more opportunity for interallelic conversion and can therefore express larger numbers of MHC alleles. c. Directional selection mechanisms favor heterozygotes and provide selective advantage to pathogen exposure. d. As heterozygosity increases, so does the concentration of alloantibodies in the serum, some of which cross-react with and neutralize HIV.
Similar cells with common goals combine to form organs
Indicate whether the statement is true or false
What is a near death experience (NDE)?
What will be an ideal response?
Which of the following is considered the best way to lose weight?
A. Follow a diet with few carbohydrates. B. Confine eating to one type of food, preferably fruit or salads. C. Eat a wide variety of foods, but keep calories and fat under your daily expenditure. D. Follow a diet low in salt. E. Drink a lot of water instead of eating so much food.