How does drug resistance spread through the HIV in the body?
a. The trait is passed from one HIV virus to another within one generation. b. Once one virus has mutated into a drug resistant strain, many other viruses spontaneously mutate. c. The drug resistant mutant is more fit, surviving and reproducing more than other strains. d. The human immune system is no longer able to recognize the mutant antigen. 17. AZT works by a. altering the HIV antigens. b. spurring lymphocytes to produce more antibodies. c. disabling HIV reverse transcriptase. d. preventing HIV from entering into the lymphocyte cell. 18. Which of the following is a Darwinian explanation for why roses have thorns? a. Roses needed thorns to protect themselves from predators. b. Roses acquired thorns in response to predation and passed them on to their children. c. Roses that had mutations for thorns survived and produced more offspring than those that did not. d. Roses mutated rapidly in response to predation. 19. Why does infection with the HIV virus not turn into AIDS right away?
