The mechanism by which the azt drug helps to protects

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61) The mechanism by which the AZT drug helps to protects against HIV: a) It prevents the HIV virus from entering a CD4 + helper T-cell. b) It makes the Δ CCR5 allele better at preventing the HIV virus from entering a CD4 + helper T-cell. c) It directly blocks reverse transcription of the HIV viral genome. d) It directly blocks transcription of the DNA copy of the HIV viral genome. e) Both answers b & d are correct. 62) AZT is effective initially, but not after a few years, because: 63) HIV infection leads to AIDS when:
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64) Which of the factors listed below would NOT decrease the probability of an influenza pandemic: 65) Based on your knowledge of the way AZT protects against the HIV virus, which statement is true concerning a new anti-HIV drug that is a base analog of the Guanine DNA nucleotide . a) Resistance to the new drug by HIV will evolve slower when the base analog mimics the guanine DNA nucleotide less well. b) Resistance to the new drug by HIV will evolve faster when the base analog perfectly mimics the guanine DNA nucleotide. c) Resistance to the new drug by HIV will evolve faster when the drug also acts to increase the population size of HIV. d) Resistance to the new drug by HIV will evolve faster when the drug also acts to decreases the population size of HIV. e) Both answers a & d are correct. Use the following information for the next 5 questions (until you see a solid line): Three strains of an asexual pathogenic bacteria were mistakenly introduced to a hospital when a technician overturned a cart containing 5 flasks of penicillin resistant bacteria, 3 flasks of tetracycline resistant bacteria, and 2 flasks of streptomycin resistant bacteria. Penicillin, tetracycline and streptomycin are antibiotics. You can assume that all of the flasks had the same number of bacteria in them. A month later patients were screened for infections by the same strains of bacteria with the following results: 20 cases of penicillin-resistant infections, 60 cases of tetracycline resistant infections, and 20 cases of streptomycin-resistant infections. You
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