Practice MCAT Question - Q59
Purines are double-ringed nitrogenous bases, while pyrimidines are single-ringed bases. Which of the following must be true?
A. In a double-stranded molecule of DNA, there will normally be an equal number of purines and pyrimidines.
B. In a single-stranded molecule of RNA, there will normally be an equal number of purines and pyrimidines.
C. In a double-stranded molecule of DNA, there will normally be twice as many pyrimidines as purines.
D. In a single-stranded molecule of RNA, there will normally be twice as many pyrimidines as purines.
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