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goldsborough exam - Goldsborough midterm answers Thursday...

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Goldsborough midterm answers Thursday, 28 February (30 marks) Fill-in-blank (1 mark each) 7. graded 8. bioassay 9. mechanistic 10. toxikon 11. tolerance 12. no observable effect concentration 13. Rachel Carson (surname only is acceptable) 14. bioconcentration factor Definition (3 marks each) 15. Hazard is a condition having a negative effect on growth of a living organism at concentrations or levels of that condition likely to occur in the natural environment. It is usually measured as a result of bioassay work. Risk is the statistical probability that a certain defined hazard will occur, calculated using information on the environmental behaviour (environmental chemistry), and biological effects (environmental toxicology) of a specific toxicant. In other words, hazard is a definable impact whereas risk is the probability of occurrence for that risk at environmentally realistic exposure levels. 16. Teratogenic effects of toxicants concern fetal development, resulting in birth defects whereas mutagenic effects concern genetic mutations.
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