AEP Environmental Health & Toxicology 2

Question 1

In human health risk assessment, cancer risk from chronic chemical exposure is calculated as:

Accepted Answer

Risk = Chronic Daily Intake (CDI) × Cancer Slope Factor (CSF)

Answer

Risk = Exposure Concentration × Body Weight

Answer

Risk = Hazard Quotient × Reference Dose

Answer

Risk = NOAEL ÷ Uncertainty Factor

Question 2

The Hazard Quotient (HQ) used in non-cancer risk assessment is calculated as:

Accepted Answer

Exposure dose divided by the reference dose

Answer

Reference dose divided by the exposure dose

Answer

Cancer slope factor multiplied by chronic daily intake

Answer

LD50 value divided by body weight

Question 3

For residential sites with soil contamination, which exposure pathway typically contributes most to risk for young children?

Accepted Answer

Incidental soil ingestion and dermal contact with soil

Answer

Dermal contact with surface water

Answer

Inhalation of outdoor ambient air

Answer

Consumption of contaminated fish tissue

Question 4

ATSDR Toxicological Profiles serve which primary purpose in environmental health practice?

Accepted Answer

Providing comprehensive health effects and exposure data for specific hazardous substances

Answer

Listing all CERCLA-regulated chemicals and their cleanup standards

Answer

Establishing risk-based cleanup levels for Superfund sites

Answer

Inventorying toxic chemical releases required by EPCRA Section 313

Question 5

Which statement most accurately describes the dose-response relationship in toxicology?

Accepted Answer

The quantitative relationship between the amount of chemical exposure and the magnitude of biological effect in a population

Answer

Higher doses always produce proportionally equal increases in biological response

Answer

A strictly linear relationship between carcinogen dose and tumor incidence

Answer

The time elapsed between initial exposure and the appearance of clinical symptoms

Question 6

Polychlorinated biphenyls (PCBs) are priority environmental contaminants primarily because they:

Accepted Answer

Are persistent, lipophilic compounds that biomagnify through aquatic food chains

Answer

Are highly water-soluble and migrate rapidly into drinking water aquifers

Answer

React photochemically with ozone to form acutely toxic byproducts

Answer

Rapidly volatilize from soil surfaces and contaminate indoor air

Question 7

Which term describes a chemical that causes malformations or developmental defects in a developing fetus?

Accepted Answer

Teratogen

Answer

Mutagen

Answer

Neurotoxin

Answer

Sensitizer