DNA编码带有遗传讯息,决定着遗传性状的传递。1953年华生和克里克确定其分子结构为双条长链相互盘旋形成双螺旋的聚合物,每条链由一长串的单体核酸组成。

• "It is the chemical substance of genes. Its structure, with two strands wound around each other in a double helix to resemble a twisted ladder, was first described (1953) by Francis Crick and James D. Watson."