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SAT Biology Subject Test Practice Questions

Category - Biology

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Adenine and guanine are examples of:
  1. Pyrimidines
  2. Phosphates
  3. Lipids
  4. Purines
  5. Polysaccharides
Explanation
Answer: D, Purines. Adenine and guanine are the purine bases used in DNA.

Key Takeaway: Purines and pyrimidines are the two classes of nitrogenous bases used in DNA and RNA. Thymine, cytosine, and uracil are all examples of pyrimidines, and uracil replaces thymine in RNA. This means RNA is comprised of one purine and three pyrimidines.
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