Practice Quiz

MCAT Biology - Question List

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51. Energy for most chemical reactions in cells is supplied by which of the following molecules?
  1. ATP
  2. DNA
  3. adrenaline
  4. hemoglobin
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52. When locust populations grow too large for an area, the individual locusts are crowded and food becomes scarce. In response to these conditions, some of the locusts leave the area and find a new habitat.Which of the following terms best applies to the response of the locusts that leave for the new habitat?
  1. commensalism
  2. emigration
  3. hibernation
  4. mutualism
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53. Which of the following statements best explains why offspring produced by sexual reproduction often look similar to, but not exactly the same as, their parents?
  1. The offspring have genetic material from both the mother and the father.
  2. The cells of the offspring contain all the dominant genes from the parents.
  3. The cells of the offspring undergo mitosis many times as the offspring grow and develop.
  4. The offspring have a period of embryonic development, rather than being born immediately after fertilization.
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54. 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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55. 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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