The two strands making up the double helix of DNA are said to be

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The two strands making up the double helix of DNA are said to be complementary because they are composed of nucleotide bases that pair specifically: adenine (A) always pairs with thymine (T), and cytosine (C) always pairs with guanine (G). This pairing allows for accurate replication of DNA during cell division and also facilitates transcription into RNA. While the strands are also paired, corresponding, and matching, the term complementary is the most specific and accurate descriptor.

The Two Strands Making Up the Double Helix of DNA