Why is combination drug therapy for HIV/AIDs less likely to lead to resistance t

Question

Why is combination drug therapy for HIV/AIDs less likely to lead to resistance than single drug therapy? There are fewer side effects associated with combination drug therapy, and the appearance of resistance is directly related to the severity of side effects. The likelihood of one virus spontaneously mutating to be resistant to several different drugs at the same time is extremely small. The drugs improve the immune system so that it is better able to find and remove virus particles. In the presence of multiple drugs, the mutation rate of HIV decreases. Suppose you were in charge of sending an unmanned space probe a new planet in search of life. The probe would be able to collect and test samples and make observations, but the planet is too far away for the probe to be able to bring samples back to Earth. The probe is small and would only be able to run a few tests, so you want to a test for evidence of life that is broad enough to incorporate all forms of life as we know it. Which one of the following tests would be the best to use in this situation? a test for the presence of large organisms capable of movement a test for the presence of things that change size quickly, since it would be an indication of growth and development a test for the presence of soil suitable for growing plants a test for the presence of cells that contain DNA

Explanation / Answer

1.Correct answer would be:The likelihood of one virus spontaneously mutating to be resistant to several different drugs at the same time is extremely small.

Reason: Combination drug therapy is useful as virus cannot resist multiple drugs at a time.

2.Correct answer would be:a test for the presence of cells that contain DNA.

Reason:Cells with DNA form the basis of life and heredity.

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