In the context of regression analysis, a variable that allows us to isolate the causal effect of a treatment on an outcome due to its exogenous correlation with the treatment is known as a(n):
A. difference in difference estimator.
B. dummy variable.
C. instrumental variable.
D. control variable.
Answer: C
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Which of the following infectious agents and means of disposal are mismatched?
A. Carcasses of animals that died of anthrax must be incinerated to avoid endospores entering the soil. B. Drums made with animal hides should be treated with sterilizing gas to eliminate endospores. C. Mosquito bed nets must be washed in bleach weekly to eliminate any residual Plasmodium. D. Coagulation factors purified from blood must be heat-treated to destroy HIV.
What typically leads to cancers associated with mammalian insulin growth factor 2 (Igf2)?
a. duplication b. translocation c. X-inactivation d. loss of imprinting
Which of the following statements about fish gills is true?
A) They have a large surface area. B) Because of their efficiency, they only need a small surface area. C) They have a poor blood supply. D) Like lungs, they have an exhale/inhale function.
Replacing a patient's defective gene with a fragment containing a functional gene is
A. gene therapy. B. genomics. C. gene cloning. D. gene mapping. E. gene selection.