Imagine that a pharmaceutical company was successful at producing a drug based on the CCR5 gene product that is effective at preventing the contraction of AIDS. However, shortly after the drug has been in use, patients and doctors report that the drug is
not as effective as it once was. What is the most likely explanation for this result?
A) The people taking the drug have built up a tolerance to the drug.
B) Some HIV viruses have genetic variations in the RNA genome that provide resistance to the actions of the drug.
C) The HIV virus gained mutations in its DNA genome in order to become resistant to the actions of the drug.
D) The DNA of white blood cells of the people taking the drug has mutated to become resistant to the drug.
Answer: B
You might also like to view...
Which of the following blood vessels carry CO2-rich (and oxygen-poor) blood back to the heart? Select all correct choices
A. venules B. arterioles C. veins D. arteries E. capillaries
What do you know about ice? How does it relate to the question?
What will be an ideal response?
Asexually produced fungal spores are ______, whereas fungal cells produced sexually, by the fusion of two mating strains, are _______
a. haploid; dikaryons b. haploid; diploid c. diploid; dikaryons d. diploid; haploid e. dikaryons; diploid
In the wake of the Ebola outbreak in West Africa in 2014-2016, researchers observed infectious Ebola virus is present in the eyes and semen of infected individuals months after apparent recovery from the acute stage of the disease. Based on information in this chapter, propose an explanation for this observation.
What will be an ideal response?