“链”[1](英語:Strand,也称“股”[2][3])在分子生物学中指一段核酸分子(如RNA與DNA),可为单链、双链。一般DNA分子是由双链形成的螺旋结构;而一般RNA分子是单链结构,其局部折叠处则为例外,但亦有双链RNA病毒的存在。[4]
“链”(英語:Chain)也可指其他由多个单体通过共价键连接的线性结构,例如:多肽链、多糖链。
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