Evidence for the evolution of antibiotic resistance in bacteria has been evaluated ________
A) in populations of bacteria within individual patients
B) in studies comparing newly diagnosed patients v. patients who have relapsed after antibiotic treatment
C) in studies comparing the fraction of patients with resistant bacteria and society-wide use of antibiotics
D) in all of the above examples
E) in no empirical studies; there is no evidence that antibiotics act as a selective agent
D
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If researchers never evaluated the amount of 14C in the atmosphere, they could still use 13C levels to demonstrate causation between human activities and increased atmospheric CO2
A. true B. false
Biological magnification is best defined as ____
a. the increase in toxicity of a chemical compound resulting from its metabolism by a living organism b. the higher relative proportion of biomass among producers as compared to consumers in an ecosystem c. the concentration of nondegradable poisons within organisms at higher trophic levels d. the concentration of degradable poisons within organisms at lower trophic levels e. the declining relative proportion of nondegradable poisons in organisms at higher trophic levels as compared to those at lower trophic levels
Which of the following best describes sex-linked genes?
a. They are located on the X chromosome. b. They are linked to the sex-determining gene. c. They are expressed differently based on the sex of an individual. d. They are determinants of the sex of an individual.
Into which group would you place a unicellular organism that has 70S ribosomes and a peptidoglycan cell wall?
A) Animalia B) Bacteria C) Fungi D) Plantae E) Protist