Practice Quiz

IB Biology Exam Prep - Question List

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6. What is the function of the myelin sheath that surrounds neurons?
  1. Increase speed of impulses
  2. Maintain polarization
  3. Decrease friction
  4. Control growth of neurons
  5. Oxygen exchange
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7. A particular food chain consists of squirrels, which feed on vegetation, weasels, which feed on squirrels, and hawks, which feed on weasels and squirrels. Rank the animals from least to most numerous in this particular environment.
  1. Hawks, squirrels, weasels
  2. Squirrels, weasels, hawks
  3. Weasels, hawks, squirrels
  4. Hawks, weasels, squirrels
  5. Squirrels, hawks, weasels
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8. All of the following are products of the nitrogen cycle EXCEPT:
  1. N2
  2. NO3
  3. NO2
  4. NH3
  5. O2
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9. Which of the following is NOT considered a building block for a larger, more complex structure?
  1. Glucose, a monosaccharide
  2. Guanine, a nitrogenous base
  3. Alanine, an amino acid
  4. Lipase, an enzyme
  5. Lactose, a disaccharide
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10. Giraffes with longer necks can reach more food and are more likely to survive and produce offspring. This is an example of:
  1. Natural selection
  2. Divergent evolution
  3. Coevolution
  4. Speciation
  5. Convergent evolution
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