IUPAC definition : The specific association between two complementary strands of nucleic acids that results
from the formation of hydrogen bonds between the base components of the nucleotides
of each strand: A T and G C in DNA, A U and G C (and sometimes G U) in RNA (the lines
indicate the number of hydrogen bonds). Single-stranded nucleic acid molecules can
adopt a partially double-stranded structure through intrastrand base pairing.;
The specific association between two complementary strands of nucleic acids that results
from the formation of hydrogen bonds between the base components of the nucleotides
of each strand: A T and G C in DNA, A U and G C (and sometimes G U) in RNA (the lines
indicate the number of hydrogen bonds). Single-stranded nucleic acid molecules can
adopt a partially double-stranded structure through intrastrand base pairing.