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BIO NMDCAT Structure of DNA
nmdcat.online July 3, 2026

5. The purine base that pairs with thymine via two hydrogen bonds in the native DNA double helix is

A. Cytosine
B. Guanine
C. Adenine
✓
D. Uracil

📝 Explanation

Adenine (a purine) always pairs with thymine (a pyrimidine) using two hydrogen bonds in standard Watson-Crick base pairing.

📖 Additional Information

  • Cytosine
  • Guanine
  • Adenine
  • Uracil

Adenine (a purine) always pairs with thymine (a pyrimidine) using two hydrogen bonds in standard Watson-Crick base pairing.

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