Widespread use of pesticides has lead to pesticide-resistant insects, just as overprescribing antibiotics has led to antibiotic-resistant bacteria. These are both examples of ________ at work.
Fill in the blank(s) with the appropriate word(s).
Evolution
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Cystic fibrosis affects the lungs, the pancreas, the digestive system, and other organs, resulting in symptoms ranging from breathing difficulties to recurrent infections. Which of the following terms best describes this?
A) incomplete dominance B) multiple alleles C) pleiotropy D) epistasis E) codominance
When Dr. Schmidt-Nielsen and his colleagues followed a "pulse" of 100% inhaled oxygen through the respiratory system of an ostrich, the oxygen pulse went to the
A. posterior air sacs to the lung and then to the anterior air sacs before being exhaled. B. anterior air sacs to the lung and then to the posterior air sacs before being exhaled. C. lung and then to the anterior air sacs and finally the posterior air sacs before being exhaled. D. lung and then to the posterior air sacs and finally the anterior air sacs before being exhaled. E. lung and then back out with exhalation—the air sacs were not involved.
A newly defined interpretive category termed "Susceptible-Dose Dependent" (SDD) implies susceptibility of an isolate is dependent on dosing regimen. Which of the following statements is correct?
a. SDD is included within the susceptible category definition. b. SDD is assigned to therapeutic agents that are approved under investigational use only. c. The infecting organism may be effectively treated by using higher doses or more frequent doses or both of the drugs. d. Drugs in this category have narrow thera-peutic indices and their use at nonconven-tional ways must be monitored closely.
What is the problem when proteins misfold? a. The misfolded protein will become a prion and misfold other proteins
b. When proteins misfold they don't create any type of problem. c. The proteins start to work slower. d. The proteins start to work faster. e. Proteins never misfold.