Which of the following is true of purines?
A) Cytosine is a purine.
B) Adenine's bonding to thymine is stronger than is guanine's to cytosine.
C) Purines have a double-ringed structure.
D) Both adenine and thymine are purines.
E) Purines bind readily to deoxyribose but not to ribose.
Correct Answer:
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