Adenine on one DNA strand is attached to a thymine base on the opposite nucleotide strand.

Quick Scoop

  • In DNA, bases pair in a very specific way called complementary base pairing.
  • Adenine (A), a purine base, always pairs with thymine (T), a pyrimidine base, across the two strands of the double helix.
  • These A–T pairs are held together by hydrogen bonds and help stabilize the DNA double-helix structure.

So, when one nucleotide contains adenine, the base attached to it on the opposite strand is thymine.

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