How did the researchers first know that Marilyn the chimp may be infected with HIV?
a. Because she had HIV RNA in her blood
b. Because she had HIV DNA in her tissues
c. Because she had been used in HIV research
d. Because she had raised antibodies against HIV
e. Because she had symptoms of HIV infection, or AIDS
d. Because she had raised antibodies against HIV
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If someone who is severely allergic to bee stings gets stung, the person may experience anaphylactic shock, which can cause a fatal drop in blood pressure
The drop in blood pressure is due to an inappropriate release of histamine in response to the sting. Histamine causes massive vasodilation, so how does this affect blood pressure?
Which example describes microevolution?
A) Birds evolved from dinosaurs. B) Lions and tigers evolved from a common cat-like ancestor. C) HIV evolved resistance to antiviral medications. D) Land plants evolved from algae.
Which of the following statements best expresses the concept of punctuated equilibrium
A. Small variations gradually accumulate in evolving lineages over periods of millions of years B. Random mating ensures that the proportions of genotypes in a population remain unchanged from generation to generation C. Stability is achieved when selection favors the heterozygote, while both types of homozygotes are at a relative disadvantage D. Evolutionary changes consist of rapid bursts of speciation alternating with long periods which species remain essentially unmodified E. Under competition for identical resources, one of the two competing species will be eliminated or excluded
Which step is not involved with constructing a representative sample?
A. Collect the sample by randomly sampling from each stratum (defined by your pre-chosen independent variables). B. Run a t-test to check if the outcomes are different across stratums. C. Use information about the population to stratify (categorize) each of the chosen variables. D. Choose the independent variables you want to match.