Practice Quiz

CLEP Biology Practice Exam - Question List

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26. The atmosphere contains about 80% nitrogen gas, but nitrogen in this form cannot be used by plants. Which of the following processes converts atmospheric nitrogen to a useful form for plants?
  1. nitrogen decomposition
  2. nitrogen fixation
  3. photosynthesis
  4. transpiration
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27. Which of the following processes produces the nucleotide sequence UUA from the sequence AAT?
  1. meiosis
  2. replication
  3. respiration
  4. transcription
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28. The nose serves all the following functions except
  1. providing an airway.
  2. moistening inhaled air.
  3. filtering dust and particles from inhaled air.
  4. transferring oxygen from the air to the bloodstream.
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29. A population is separated into two groups by a geographic barrier. Over time, enough differences develop between the two groups that they do not interbreed when reunited. Which of the following terms best describes the process that has occurred?
  1. extinction
  2. hybridization
  3. immigration
  4. speciation
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30. Hemoglobin is a protein that carries oxygen in red blood cells. The hemoglobin molecules produced by some people have one specific amino acid that is different from the amino acid at that position in normal hemoglobin.Which of the following is the most likely cause of this amino acid variation?
  1. The hemoglobin gene contains a mutation.
  2. An error occurs during the folding of the hemoglobin protein.
  3. Enzymes replace the amino acid once the hemoglobin is produced.
  4. An additional amino acid is mistakenly inserted into the hemoglobin during translation.
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