Purine base that bonds with thymine or uracil.

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Multiple Choice

Purine base that bonds with thymine or uracil.

Explanation:
Adenine is the purine base that pairs with thymine in DNA and with uracil in RNA, using two hydrogen bonds. Purines are the larger, two-ring bases, and they fit specifically with the smaller pyrimidines—thymine or uracil—in a complementary fashion that preserves the DNA/RNA structure. That’s why adenine is the base that bonds with thymine or uracil. The other bases don’t fit this pairing pattern: guanine is a purine that pairs with cytosine, while cytosine and thymine are pyrimidines that pair with their respective purine partners.

Adenine is the purine base that pairs with thymine in DNA and with uracil in RNA, using two hydrogen bonds. Purines are the larger, two-ring bases, and they fit specifically with the smaller pyrimidines—thymine or uracil—in a complementary fashion that preserves the DNA/RNA structure. That’s why adenine is the base that bonds with thymine or uracil. The other bases don’t fit this pairing pattern: guanine is a purine that pairs with cytosine, while cytosine and thymine are pyrimidines that pair with their respective purine partners.

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