Practice Quiz

MCAT Biology - Question List

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46. Heartburn is pain that occurs when acidic gastric juice is forced out of the upper end of the stomach. In which of the following organs does a person experience heartburn?
  1. pancreas
  2. esophagus
  3. small intestine
  4. large intestine
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47. The size of a bird population increased by two percent in one year. Which of the following could have contributed to the population increase?
  1. a decrease in the death rate of baby birds
  2. an increase in the number of the birds’ predators
  3. an increase in the average number of parasites per bird
  4. a decrease in the immigration of birds of the same species
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48. In a molecule of double-stranded DNA, the amount of adenine present is always equal to the amount of
  1. cytosine.
  2. guanine.
  3. thymine.
  4. uracil.
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49. Which of the following statements best explains why oxygen diffuses from the alveoli into the blood?
  1. The diaphragm draws oxygen into the alveoli at a rapid speed.
  2. Alveoli cells contain hemoglobin to transfer gases to the blood.
  3. The concentration of oxygen is greater in the alveoli than in the blood.
  4. Red blood cells move one at a time through the capillaries surrounding the alveoli.
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50. Which of the following statements gives the most likely explanation for the presence of two very similar species of squirrels living on opposite sides of the Grand Canyon?
  1. One squirrel traveled across the canyon and started a new population on the other side.
  2. One squirrel traveled across the canyon and interbred with a different population on the other side.
  3. Members of a single squirrel species were geographically separated by the formation of the canyon.
  4. Members of two different squirrel species migrated from two different places to opposite sides of the canyon.
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