In genetics, a double-stranded DNA or RNA strand consists of two complementary strands of base pairs, which are non-covalently connected via two or three hydrogen bonds.

Since there is only one complementary base for any of the bases found in DNA/RNA, one can reconstruct a complementary strand for any single strand. This is essential for DNA replication.

For example, the complementary strand of the DNA sequence A G T C A T G is T C A G T A C

A= adenine G= Guanine T= thynine c= cytosine u= uracil

Compliment and complementation have several different meanings in Biology, see Complement for other uses.

See also

• Watson and Crick Base Pairing
• Complementary DNA.

Complementarietà (biologia molecolare)

Molecular biology