Which of the following statements about the herbicide atrazine is false?
a. Atrazine is used for weed control, mostly in cornfields
b. Atrazine from agricultural runoff persists in soil and water for decades.
c. Atrazine causes or contributes to frog deformities.
d. Male frogs exposed to atrazine at levels below those allowed in drinking water develop ovary tissue.
b
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A sick person often has a fever, which can inhibit the growth of bacteria because
A) bacteria reproduce more rapidly at higher body temperature. B) enzymes do not function as well at temperatures other than the optimal temperature. C) the higher temperature increases the activity of lyases. D) sweating removes prosthetic groups from biological enzymes. E) fever blocks synthesis of proteins in the bacterial nucleus.
A 36-year-old woman is on a cruise ship and later develops nausea, abdominal pain, vomiting, and diarrhea. She is most likely suffering from which virus?
a. Norovirus b. Rotavirus c. Coronavirus d. Torovirus
All connective tissues share which of the following structural features?I Contain cellsII Contain a matrix filled with extracellular materialIII Contain sarcomere units
A. II only B. I and III C. I and II D. I, II, and II E. II and III
When might it be the case that a difference-in-differences estimator still does not identify a consistent estimate of the causal treatment effect?
A. If there are non-time varying effects that generate differences between treated and non-treated groups. B. If there are time varying effects that generate amongst both treated and non-treated groups symmetrically. C. If there are time-varying trends that are different amongst treated and non-treated groups. D. If the treatment is non-normally distributed.