The Bases of Nucleic Acids Are Purines or Pyrimidines

question 65

Multiple Choice

The bases of nucleic acids are purines or pyrimidines.Which statement contrasting purines and pyrimidines is true?

• A) Purines include the bases cytosine and thymine, whereas pyrimidines include the bases adenine and guanine.
• B) Pyrimidines are found in RNA, whereas purines are found in DNA.
• C) Purines are double-ring structures, whereas pyrimidines are single-ring structures.
• D) Purines have only single bonds in their structure, whereas pyrimidines have both single and double bonds in their structure.
• E) Purines consist of hydrogen, carbon, oxygen, and nitrogen, whereas pyrimidines have phosphorus, hydrogen, carbon, oxygen, and nitrogen.

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