In molecular biology, complementarity describes a relationship between two structures each following the lock-and-key principle.

What is the complementary strand of DNA?

Complementary deoxyribonucleic acid (DNA) is DNA in which the sequence of the constituent molecules on one strand of the double stranded structure chemically matches the sequence on the other strand. A useful analog is to picture a key and a lock. ... Complementary DNA (cDNA) is a copy of a region of a strand of DNA.

What are complementary strands?

Complementary strands. (Science: molecular biology) two single strands of dna in which the nucleotide Sequence is such that they will bind as a result of base pairing throughout their full length.