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Which of the following statements accurately describes the structural difference between pyrimidines and purines?a) Pyrimidines consist of two rings, while purines have a single ring..b) Pyrimidines consist of a single ring, while purines have two rings..c) Pyrimidines consist of three rings, while purines have a single ring..d) Pyrimidines consist of a single ring, while purines have three rings.

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