MODERN DENTAL ASSISTING ACTUAL EXAM SCRIPT 2026 FULL QUESTIONS AND CORRECT ANSWERS GRADED A+

MODULE 3 WATER QUALITY
COMPREHENSIVE REVIEW 2026 FULL
QUESTIONS AND VERIFIED ANSWERS

◉ Environmental Transformation Answer: When non-toxic
contaminants become toxic due to their presence in the environment


◉ Sources of Contaminants to the Environment Answer: - Agriculture
Contaminants
- Drugs and Personal Care Prod.
- Waste Streams
- Mineral Extraction or Disturbance
- Atmospheric Emissions
- Municipal Uses


◉ Water Withdrawals Answer: Freshwater taken from ground or surface
water sources, either permanently or temporarily, and conveyed to a
place of use.
1. Thermoelectric
2. Irrigation
3. Public Supply
4. Industrial
5. Ag, mining, domestic

, ◉ Clean Water Act Answer: Basic structure for regulating discharges of
contaminants into the waters of the US, and regulating SURFACE
WATER
- sets recommendations for contaminant levels in surface waters


◉ National Primary Drinking Water Regulations Answer: Legally
enforceable standards for drinking water from public water systems
- includes organic and inorganic


◉ Sackett v. EPA Answer: Wetlands count as surface water


◉ The Clean Water Act: Water Quality Standards Answer: - Designated
uses
- Criteria to protect those uses
- Antidegradation requirements


◉ Transboundary Waters Answer: River basins shared by two or more
countries


◉ Inorganic Uptake Answer: The uptake of inorganic contaminants is
often because the contaminant "looks" like an essential nutrient or
essential metal (biomimicry)


◉ Organic Uptake Answer: The uptake of organic contaminants is
controlled by how the compound interacts with water vs. a biological
membrane (Kow)