Estrogens from birth control pills
a. are excreted in the urine.
b. are removed during standard wastewater
treatment.
c. can cause female fish to develop male traits.
d. have different effects in fish than those of
industrial estrogen-mimicking pollutants.
e. do none of these.
Answer: a
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You awaken to find yourself lying on the bare ground, dirty and injured. In the dim light, you can make out wreckage around you and surmise that you have survived a plane crash. Over the next few days, you wander the hot, humid area and find an amazing number of different plant and insect species. You are able to trap and eat several rodent size mammals, but do not see any larger mammals. Into what biome did your plane crash?
A. Tropical grassland B. Taiga C. Temperate rain forest D. High desert E. Tropical rain forest
Bicarbonate ions in the blood can absorb hydrogen ions, keeping pH balanced. Bicarbonate is acting as a ________ in blood.
A. alkaline B. base C. buffer D. acid
Ventilation causes alveoli of the lungs to have ________ the blood in pulmonary capillaries.
A. the same PO2 and PCO2 as B. a higher PO2 and a lower PCO2 than C. a lower PO2 and a higher PCO2 than D. No answer is correct.
The DNA of chromosomes is composed of two strands wound about each other in the shape of a ________
Fill in the blank(s) with correct word