Question: Toxicology considers all substances to be potentially toxic.

Answer Choices: True False

Answer: True

Question: Autotrophs (or primary producers)—for the most part plants, algae, and some bacteria—harness solar energy through photosynthesis, reducing inorganic carbon (in forms such as CO2) to organic carbon (such as carbohydrates) whose chemical bonds contain energy.

Answer Choices: True False

Answer: True

Question: Group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.

Answer Choices: A. Species B. Assemblage C. Biome D. Ecosystem

Answer: A – Species

Question: An ecosystem is a complex system of organisms and their environment, including both living (biotic) and nonliving (abiotic) components, and the interactions that connect them.

Answer Choices: True False

Answer: True

Question: The __________ is a quantitative description of the association between exposure to a compound and the toxic effects produced by the exposure.

Answer Choices: A. Toxicology B. Dose response relationship C. Endocrine disruption

Answer: B – Dose response relationship

Question: Biodiversity (or biological diversity) is the degree of variation of life, encompassing genetic variation, phenotypic variation, and different life history stages.

Answer Choices: True False

Answer: True

Question: The LD50, or lethal dose for 50%, is the dose of a chemical that kills 50% of those exposed to it in a defined time frame.

Answer Choices: True False

Answer: True

Question: Which of the following is not an ecosystem service?

Answer Choices: A. Distribution service B. Provisioning service C. Regulating service D. Cultural service

Answer: A – Distribution service

Question: A Reference Dose (RfD) is set by dividing the NOAEL by one or more uncertainty factors.

Answer Choices: True False

Answer: True

Question: A xenobiotic is a:

Answer Choices: A. Chemical that mimics an antibiotic B. Chemical foreign to the body C. Chemical that causes growth D. Chemical that interrupts thyroid function

Answer: B – Chemical foreign to the body