If the new drug was only partially effective and

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73) If the new drug was only partially effective and decreased the population size of HIV within an infected individual, then: A) The virus would stop evolving in drug-treated individuals B) AZT would have a longer benefit (compared to that in people not taking the new drug) C) The “escape hypothesis” predicts that the lifespan of HIV-infected individuals would be extended by the drug D) Both answers B & C are correct E) None of these answers are correct 74) Suppose that you observed that there was heritable variation among house flies for resistance to a pesticide, and that in environments where the pesticide is not used the lifetime fecundity of flies that were resistant to the pesticide was one offspring, and that of flies that were not resistant was ten offspring. Which statements are true: 75) Characteristics of an influenza virus that would lower the probability of a new influenza outbreak are: Use the following information for the next 5 questions (until you see a solid line): Suppose that a small haploid, asexual invertebrate (water flea) has an annual life cycle. It is transparent and lives in small pools (called vernal pools) that fill in the winter and then dry up during the summer. The water fleas persists by forming drought-resistant eggs when the pool begins to dry in late winter. These eggs hatch after the first major rain of the following winter. The water color of the vernal pools is clear at the start of each winter but becomes progressively browner as the winter progresses. Several years ago a mutation that makes the water fleas brown (instead of transparent) occurred. At the beginning of 2008 (just after the hatching of eggs), and after a very dry winter in 2007, a vernal pool contained 200 brown and 800 transparent water flea egg. At the beginning of 2009 (just after the hatching of eggs), after a wet winter in 2008, the numbers in the vernal pool were 6,000 brown and 4,000 transparent.
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