HLTH 505 Quiz Toxins

HLTH 505 Quiz: Toxins

Covers the Learn material from Module 4: Week 4.

  1. Which two of the following toxic substances are capable of crossing the placental barrier and causing severe fetal damage in humans?
  2. Which of the following statements about LD50 is false?
  3. Which of the following is the leading source of dioxin emissions in the U.S.?
  4. What is considered to represent the single most frequent cause of lead poisoning among American children?
  5. What danger is associated with drinking, as opposed to inhaling, asbestos?
  6. “Minamata Disease” killed or seriously disabled hundreds of Japanese who had inadvertently eaten fish contaminated with:
  7. Which of the following organisms is most acutely sensitive to the toxic effects of dioxin?
  8. Which of the following toxic substances has been found as a contaminant in farmed salmon?
  9. Mesothelioma, a cancer of the lung or stomach lining, is known as a “marker disease” because its only known cause is exposure to what toxic substance?
  10. For which toxic substances do researchers say there is no safe level—no threshold below which exposure will result in no adverse health impact?
  11. What was the toxic contaminant in Agent Orange which allegedly caused a variety of ailments among Vietnamese civilians and American servicemen exposed to the chemical during the Vietnam War?
  12. Which of the following is a major threat posed by TCDD and related chemicals?
  13. Where do PCBs, dioxins, or any of the chlorinated hydrocarbons concentrate in living tissues?


  1. Human poisonings due to mercury exposure most commonly result in what kind of health damage?
  2. PCBs, which biomagnify as they move up the food chain, are most commonly taken up by humans when they eat certain kinds of:
  3. Which of these pests is a problem because its bite results in a painful ulceration which may take months to heal and leaves a large, permanent, ugly scar?
  4. Which of the following is no longer an effective method for controlling malaria?
  5. In which of the following groups of organisms would you expect to see the greatest effects of pesticide biomagnification?
  6. For what accomplishment did Paul Muller receive a Nobel Prize in 1948?
  7. What was the major reason EPA gave for banning the use of most chlorinated hydrocarbon insecticides?
  8. What is meant by the term “integrated pest management”?
  9. Minamata Disease, reproductive failure among peregrine falcons and eagles exposed to DDT, and the death of western grebes at Clear Lake, CA, are all examples of:
  10. When did DDT first come into widespread use?
  11. What characteristic of botanical insecticides such as pyrethrum and rotenone makes them useful?
  12. What is the basic cause of the phenomenon known as “secondary pest outbreak”?
  13. Which of the following pesticidal groups is most acutely toxic to the pesticide applicator?
  14. What characteristic of the organophosphate insecticides makes them more environmentally acceptable than the chlorinated hydrocarbons?
  15. An example of a persistent, broad-spectrum insecticide is:
  16. The mosquito-borne illness of greatest concern in the United States today is:
  17. Lyme disease is a newly recognized ailment transmitted by the bite of which of these pests?


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