Practice Quiz

CLEP Natural Sciences - Biological Science - Question List

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26. Scientists have concluded that snakes evolved from an ancestor with legs. Which of the following statements provides the best evidence for this conclusion?
  1. Most species of snakes live on land.
  2. Snakes move extremely fast to catch their prey.
  3. Snakes have a well-developed backbone and muscular system.
  4. Some species of snakes have limb buds during their embryonic development.
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27. Baby food manufacturers sometimes use proteases in their products. Proteases catalyze the breakdown of the proteins in these foods, making digestion easier for infants. Proteases are which of the following types of molecules?
  1. enzymes
  2. fatty acids
  3. hormones
  4. monosaccharides
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28. Shelly and Jason are siblings, but Shelly looks like their father while Jason looks like their mother. Which of the following statements best explains the difference in Shelly’s and Jason’s features?
  1. Shelly inherited a greater number of chromosomes from their father than Jason did.
  2. Shelly inherited a smaller number of X chromosomes from their mother than Jason did.
  3. Shelly and Jason had different mutations occur in the 46 chromosomes they inherited from their mother and father.
  4. Shelly and Jason inherited different combinations of 23 chromosomes from their mother and 23 chromosomes from their father.
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29. High levels of carbon dioxide in the blood trigger which of the following responses in the body?
  1. an increase in the rate of digestion
  2. an increase in the rate of breathing
  3. a decrease in the speed of the pulse
  4. a decrease in the production of sweat
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30. In July, a student tested the soil in two plots and calculated the concentration of nitrogen compounds present in each plot. The student then planted 20 seedlings in the first plot and allowed them to grow. Nothing was planted in the second plot. The student tested the soil in both plots again after one month. The concentration of nitrogen compounds had decreased in the first plot but had remained the same in the second plot. Which of the following best explains the decrease in nitrogen compounds in the first plot?
  1. The nitrogen compounds had broken down into elements.
  2. The nitrogen compounds were absorbed by the seedlings for their growth.
  3. The nitrogen compounds escaped through air pockets created by the seedlings’ roots.
  4. The nitrogen compounds had evaporated because of the warm summer temperatures.
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