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22 February, 17:32

2. Adenine and guanine are double-ringed purines

single-ringed purines

double-ringed pyrimidines

D. single-ringed pyrimidines

amino acids.

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  1. 22 February, 17:43
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    single-ringed purines

    Explanation:

    Adenine and guanine are purine bases. They are structures composed of a 5-sided and 6-sided ring. Cytosine and thymine are pyrimidines which are structures composed of a single 6-sided ring. Adenine binds to thymine, while cytosine binds to guanine. This relationship is a form of complementary base pairing. These complementary bases are bonded together by hydrogen bonds.
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