ABT Environmental Toxicology 3

Question 1

Which environmental fate parameter describes the tendency of a chemical to partition between octanol and water?

Accepted Answer

Octanol-water partition coefficient (Kow)

Answer

Henry's Law constant

Answer

Soil-water partition coefficient (Koc)

Answer

Bioconcentration factor (BCF)

Question 2

Endocrine-disrupting chemicals (EDCs) can mimic or block hormones. Which effect describes a chemical that binds estrogen receptors without activating them?

Accepted Answer

Estrogen receptor antagonism

Answer

Estrogenic agonism

Answer

Aromatase induction

Answer

Thyroid receptor agonism

Question 3

Under CERCLA, which term describes the party legally responsible for cleanup costs at a Superfund site?

Accepted Answer

Potentially Responsible Party (PRP)

Answer

Responsible Party (RP)

Answer

Environmental Violator (EV)

Answer

Site Controller (SC)

Question 4

Which route of exposure is most significant for volatile organic compounds (VOCs) at contaminated sites?

Accepted Answer

Inhalation of vapors (vapor intrusion)

Answer

Dermal absorption from soil

Answer

Ingestion of contaminated groundwater only

Answer

Ingestion of contaminated vegetation

Question 5

The concept of 'hormesis' in environmental toxicology describes:

Accepted Answer

A biphasic dose-response with low-dose stimulation and high-dose inhibition

Answer

Linear no-threshold dose-response for carcinogens

Answer

Exponential increase in toxicity with dose

Answer

Threshold effect where toxicity is zero below a certain dose

Question 6

Beryllium is classified as a Group 1 carcinogen by IARC and is associated with which occupational lung disease?

Accepted Answer

Chronic beryllium disease (berylliosis)

Answer

Mesothelioma

Answer

Silicosis

Answer

Byssinosis