問題詳情
45. Within a few weeks of treatment with the drug 3TC, a patient’s HIV population consists entirely of 3TC-resistant viruses.What is the best explanation?
(A) HIV has the ability to change its surface proteins and resist vaccines.
(B) The patient must have become reinfected with 3TC-resistant viruses.
(C) HIV began making drug-resistant versions of reverse transcriptase in response to the drug.
(D) A few drug-resistant viruses were present at the start of treatment, and natural selection increased their frequency.
(A) HIV has the ability to change its surface proteins and resist vaccines.
(B) The patient must have become reinfected with 3TC-resistant viruses.
(C) HIV began making drug-resistant versions of reverse transcriptase in response to the drug.
(D) A few drug-resistant viruses were present at the start of treatment, and natural selection increased their frequency.
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