Practice Quiz

CLEP Natural Sciences - Biological Science - Question List

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56. In traditional landscaping, leaves are raked off the ground and bagged. In which of the following ways does this practice most significantly disrupt natural nutrient cycling?
  1. It carries away microorganisms that can perform nitrogen fixation.
  2. It reduces the rate of oxygen and carbon cycling via photosynthesis.
  3. It prevents carbon, oxygen, and nitrogen from being returned to the soil.
  4. It increases the amount of carbon dioxide that is released to the atmosphere.
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57. In the past 100 years, levels of atmospheric carbon dioxide have increased as the result of the burning of fossil fuels. Other processes in the carbon cycle have absorbed some of the carbon released by this combustion. Which of the following most likely have absorbed excess carbon released by combustion?
  1. animals
  2. glaciers
  3. plants
  4. rocks
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58. In fruit flies, the gene for eye color is located on the X chromosome, and the red eye allele (R) is dominant to the white eye allele (r). A female fly with genotype XRXr is mated with a male fly with genotype XrY. Which of the following statements best describes the expected outcome of the cross?
  1. The chance of an offspring having red eyes is 75%.
  2. The chance of an offspring having white eyes is 50%.
  3. The chance that a male offspring will have white eyes is 0%.
  4. The chance that a female offspring will have red eyes is 100%.
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59. The Asian shore crab invaded parts of the eastern coast of the United States about 15 years ago. The Asian shore crab preys on blue mussels. In the time since the Asian shore crab arrived, the average shell thickness has increased in the blue mussel population. Which of the following is the most likely reason that this increase in shell thickness has occurred?
  1. Blue mussels with thick shells attract more crabs than mussels without thick shells.
  2. Blue mussels with thick shells grow in larger colonies than mussels without thick shells.
  3. Blue mussels with thick shells catch more food per day than mussels without thick shells.
  4. Blue mussels with thick shells survive and reproduce more successfully than mussels without thick shells.
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60. The northern spotted owl is listed under the Endangered Species Act as a threatened species in its primary range of Washington, Oregon, and California. Which of the following most likely contributed to the northern spotted owl’s population decline?
  1. increases in rodent populations
  2. loss of trees from forest habitat
  3. prevention of wildfiresin forests
  4. decreases in mountain lion populations
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