Part A: True or False (20 points 1. Methylmercury is less toxic to humans than e

Question

Part A: True or False (20 points 1. Methylmercury is less toxic to humans than elemental mercury 2. Cadmium is referred to as a non-toxic heavy metal 3. Methylmercury never forms from natural sources 4. DDT is an example of a chlorinated hydrocarbon 5. Chlorinated hydrocarbons have short biological half-lives 6. Organophosphate insecticides are reversible inhibitors of Acetycholine esterase 7. Highly lipid soluble toxicants with long t1/2 values tend to concentrate up the food chain 8. Dioxin (TCDD) can cause Chloracne and behavioral abnormalities 9. Both organic, ionic and elemental forms of Arsenic (As) are equally toxic 10. Propylene glycol is highly toxic

Explanation / Answer

1. False. Methyl mercury is probably most toxic among all compunds of mercury as well as the elemental mercury and causes nervous system damage.

2.False. Cadmium is infact quite toxic to humans.

3.False. It is formed when bacteria reacts with mercury in water, soil, plants.

4. True.

5. False

6. False

7.True

8. True

9. False. Inorganic arsenic is more toxic as compared to organic arsenic.

10.False. It is rather recognized as "safe" by the FDA.

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