Which Statement About Purines and Pyrimidines Is True

question 10

Multiple Choice

Which statement about purines and pyrimidines is true?

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

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