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There are two upright struts of the ladder, one shown in blue here, the other shown black.
两条上下的主链作为支柱,一条以蓝色表示,一条以黑色表示
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There are several things that you'll notice about the struts in this particular cartoon.
你们会注意到卡通模型上的,这些梯阶有些特别之处
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On the inside are the rungs or the struts that hold the ladder together.
梯子内侧是梯阶,也可以说是梯阶把梯子连接在一起
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This represents the upright struts on a ladder that I showed you before, it represents this backbone that's shown by - that's formed by polymerizing the pentose's together through phosphate's always going 5' to 3', 5' to 3'.
线条代表梯子,上下的支柱 之前给你们演示过,代表由多聚戊糖分子,通过磷酸基从5'端向3'端方向,连接起来的主链
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It's the phosphate and the pentose that make up the backbone - that make up the upright struts of the ladder and it's the bases that make up the connecting struts, so the bases are the colors.
磷酸基和戊糖,共同构成了主链,主链又构成了梯子上下的支柱,而碱基,则构成连接支柱的梯阶,碱基是用各种颜色表示的
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The backbone's on the outside of the molecule like the upright struts of a ladder on the outside of a ladder.
主链位于DNA分子结构外侧,像梯子两侧上下的支柱,记住是梯子外侧
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That's because you have to satisfy this base pair matching in order to have hydrogen bonding in each of the struts of the ladder in order to form a stable structure.
NA双链要满足互补配对原则,以使碱基对之间,形成氢键,从而形成稳定的双链结构
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