Question

13. What is the most widely accepted theory as to how HIV evolved? (A) Viral recombination in a chimp infected with multiple types of HIV. (B) US Government Bioweapon. (C) Antiretroviral and recreational drug use. (D) Recombination between two or more SIV strains 14. AIDS stands for Acquired Immuno Deficiency _ _. The definition of AIDS includes reduced number of _ _and a diagnosis of any of two dozen secondary (A) State, Tcells, viral infections (B) Syncytia, natural killer cells, diseases (B) Syndrome, CD4+ cells, antibodies (D) Syndrome, CD4+ cells, infections

Answer 1

13. Answer is D

Reason: The closest relatives of HIV-1 are simian immunodeficiency viruses (SIVs) infecting wild-living chimpanzees and gorillas in west central Africa. More than 40 species of African monkeys are infected with their own, species-specific, SIV and in at least some host species, the infection seems non-pathogenic. Chimpanzees acquired from monkeys two distinct forms of SIVs that recombined to produce a virus with a unique genome structure. Recombination of SIV causes CD4⁺ T-cell depletion and increases mortality in wild chimpanzees.

14. Answer is B

Reason:

AIDS (acquired immunodeficiency syndrome),

HIV virus kills CD4+ cells

AIDS diagnosed by the isotypes of free antibodies to HIV-1, IgM, IgG, IgA, and IgE. IgG (IgG1, IgG2, IgG3, and IgG4) and IgA (IgA1 and IgA2).