2025 Question 1 In environmental health the term toxin refers to a toxic

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Environmental Health: Local to Global: Module 1 Quiz 2025

Question 1 In environmental health, the term toxin refers to a toxic substance that _______________. [removed] is naturally produced by a plant or animal [removed] occurs in the occupational setting [removed] results from human activity [removed] a man -made product introduced into the environment due to human activity 1 points Question 2 In toxicity testing in rodents, the LD50 is a dose that is _______________. [removed] acutely fatal to 50 percent of test animals [removed] fatal to 50 percent of test animals within a 90-day period [removed] fatal to 50 percent of test animals after lifetime bioaccumulation 1 points Question 3 Which of the following is not characteristic of a health impact assessment? [removed] It evaluates a site or activity as it is, rather than looking forward in time [removed] It includes social and economic factors in the assessment [removed] It incorporates input from community members 1 points Question 4 An exposure pathway connects _______________ to _______________. [removed] an exposure / a change in tissue structure or function [removed] inhalation / absorption [removed] the environmental source of a contaminant / the point of exposure 1 points Question 5 The three major routes of human exposure to environmental contaminants are _______________. [removed] by air, water, and soil [removed] environmental, occupational, and residential [removed] ingestion, inhalation, and dermal contact 1 points Question 6 The phrase contact with the human envelope is a common definition of _______________. [removed] absorption [removed] disposition [removed] exposure 1 points Question 7 The quantity of a toxicant (or its breakdown product) that is available to interact with some vulnerable tissue in the body is called the _______________. [removed] absorbed dose [removed] biologically effective dose [removed] body burden 1 points Question 8 The body burden of a chemical in the body reflects the net effect of _______________. [removed] absorption and biological effectiveness [removed] synergism and antagonism [removed] the processes of toxicokinetics 1 points Question 9 Bioaccumulation is the _______________. [removed] gradual building up of a chemical in the tissue of an organism [removed] increase of concentrations of a chemical at higher levels of a food pyramid [removed] movement of a chemical from water to living tissue 1 points Question 10 Which of the following is an example of a biomarker? [removed] Body mass index calculated from measured height and weight [removed] Concentration of a pesticide in blood [removed] Inhalation rate in liters per hour 1 points Question 11 The Ames test is a test of a chemical’s _______________. [removed] acute lethality, and is conducted in rodents [removed] mutagenicity, and is conducted in bacteria [removed] teratogenic potential, and is conducted mammalian cells 1 points Question 12 Exposure modeling is used to estimate the _______________. [removed] biologically effective dose of a toxicant [removed] fate and transport of a toxicant [removed] ingestion of, inhalation of, or dermal contact with a toxicant 1 points Question 13 Conceptually, a reference dose is a dose that has no adverse effects in _______________. [removed] sensitive subpopulations over a long-term exposure [removed] sensitive subpopulations over a short-term exposure [removed] the general population over a long-term exposure [removed] the general population over a short-term exposure 1 points Question 14 Which of the following is one of the major processes which together make up toxicokinetics? [removed] Bioconcentration [removed] Distribution [removed] Mutation [removed] Synergism 1 points Question 15 In doing a risk assessment for a chemical, the usual assumption is that _______________. [removed] carcinogenicity has a threshold; non-cancer effects do not [removed] non-cancer effects have a threshold; carcinogenicity does not [removed] both carcinogenicity and non-cancer effects have thresholds [removed] neither carcinogenicity nor non-cancer effects has a threshold 1 points Click Save and Submit to save and submit. Click Save All Answers to save all answers.

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