APES 8.3- Endocrine Disruptors WYRNTK

Which of the following BEST describes the action of an endocrine disruptor? a. an endocrine disruptor attacks hormones that invade a body system and cause disease b. an endocrine disruptor blocks the receptor protein binding site of a hormone so that the cell cannot receive a signal c. an endocrine disruptor acts as an organic catalyst, produced by living things to regulate the rate of chemical reactions d. an endocrine disruptor helps to transport substances, such as pesticides, in an organism following exposure

b. an endocrine disruptor blocks the receptor protein binding site of a hormone so that the cell cannot receive a signal

Which of the following is the MOST likely consequence of runoff transporting chemicals that are endocrine disruptors to a pond? a. decreased turbidity in the pond b. increased frequency of birth defects in fish populations in the pond c. increased mutualistic relationships between fish and frog populations in the pond d. increased dissolved oxygen in the pond

b. increased frequency of birth defects in fish populations in the pond

Farmers in the Midwestern United States have discovered that the local frog population is declining. Scientists determined this is due to male frog's inability to produce sperm. Which of the following is the likely cause? a. exposure to arsenic from local metal smelting plants b. inhalation of inorganic mercury from local power plant emissions c. high levels of atrazine in the water d. absorption of high levels of nitric acid through their skin e. increasing UV radiation in the Midwest

c. high levels of atrazine in the water

Which of the following consumer products would MOST likely increase your exposure to bisphenol A? a. wood paneling in the home b. imported fruit from tropical regions c. plastic food containers and water bottles d. perfumes and hairsprays e. oil-based paints

c. plastic food containers and water bottles

Glyphosates are herbicides that are often applied to genetically modified (GM) crops to kill weeds without harming the crop itself. Some studies have indicated that global amphibian populations are declining and that exposure to herbicides in agricultural runoff is implicated in the decline. Which of the following is the MOST likely explanation of how herbicides affect amphibians? a. the herbicides are fat soluble and accumulate in groundwater b. the herbicides act as a plant nutrient, causing algal blooms c. the herbicides act as endocrine disruptors d. the herbicides are ingested by amphibians that mistake them for food e. the herbicides contain heavy metals

c. the herbicides act as endocrine disruptors

All of the following are associated with the feminization of organisms due to the presence of endocrine disrupters EXCEPT: a. the organisms affected are mostly aquatic b. the male testes occasionally produce eggs as well as sperm c. the males of the species develop female reproductive organs d. the endocrine disrupters interfere with the production of testosterone e. the males have higher than normal levels of estrogen

c. the males of the species develop female reproductive organs

Sources of endocrine disruptors in the environment include all of the following EXCEPT: a. wastewater from animal-rearing facilities b. DDT c. municipal wastewater d. atrazine e. acid deposition

e. acid deposition

Alligators in a Florida lake polluted by high levels of dioxins (chlorinated hydrocarbons) had low testosterone levels and failed to reproduce. Scientists came to the conclusion that dioxins were acting as what?

endocrine disruptors

Atrazine and DDT are examples of:

endocrine disruptors

The intake of synthetic mimics can severely disrupt the:

endocrine system

Endocrine disruptors directly affect what in an organism?

hormones

A compound in plastics that is classified as an endocrine disruptor is:

phthalates

You would predict that a hormone disruptor would MOST affect a(n):

tertiary consumer