Practice Quiz

MCAT Biology - Question List

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56. 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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57. The northern spotted owl is listed under the Endangered Species Act as a threatened species in its primary range of Washington, Oregon, and California. B89Which 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 wildfires in forest
  4. decreases in mountain lion populations
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58. Which of the following elements is most common in the tissues of plants?
  1. hydrogen
  2. iron
  3. potassium
  4. sodium
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59. If a cell’s lysosomes were damaged, which of the following would most likely occur?
  1. The cell would produce more proteins than it needs.
  2. The cell would have chloroplasts that appear yellow rather than green.
  3. The cell would be less able to break down molecules in its cytoplasm.
  4. The cell would be less able to regulate the amount of fluid in its cytoplasm.
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60. A species of parasitic fly follows the sounds that male crickets make with their wings. The flies deposit their larvae in the crickets’ bodies. As the larvae develop and emerge from the crickets’ bodies, the crickets die.Researchers have discovered a genetic mutation in some crickets that changes their wing structure and makes them silent. The crickets with silent wings are found among crickets with normal wings when it is time to mate.According to evolution by natural selection, which of the following will most likely occur in the cricket population, based on the selection pressure from the flies?
  1. Male crickets with silent wings will increase in frequency.
  2. The frequency of the silent wing mutation will stay the same.
  3. Male crickets with normal wings will learn to make new sounds.
  4. A new mutation will create spikes on the crickets’ wings to keep the flies away
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