Which of the following is a drawback to using coal as an energy source?
a. mining damages large areas of land
b. all of the above
c. coal miners have increased risk of respiratory illness
d. burning coal releases greenhouse gases
e. coal contains pollutants such as arsenic, nitrogen dioxide, and sulfur dioxide
Answer: b. all of the above
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Human chorionic gonadotrophin (hCG) is produced during pregnancy by the ovaries. Indicate whether the statement is true or false
In Figure 12-1, the portion of the molecule in box __________ is
a. 1
b. 3
c. 4
d. 1 and 3
e. 3 and 4
The evidence supporting Porto Santo rabbits as a new and recent species does not include:a
a different coat color pattern from mainland European rabbits. b. the ability to produce fertile offspring with mainland rabbits under experimental conditions. c. a more nocturnal lifestyle. d. being only about half the size of the mainland rabbits. e. the inability to produce fertile offspring with mainland rabbits under natural conditions
Which of the following statements regarding cancer risk factors is false?
A) Factors that alter DNA and make cells cancerous are called carcinogens. B) Mutagens are usually not carcinogens. C) X-rays and ultraviolet radiation are two of the most potent carcinogens. D) Eating 20-30 grams of plant fiber daily and reducing the intake of animal fat can reduce your risk of developing colon cancer.