DNA and RNA as the heredity matters, they belong to phosphoric di-ester that is their bridge linkage group.

遗传物质DNA和RNA是磷酸二酯，磷酸酯基团是连接核酸的桥连基团。

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DNA and RNA as the heredity matters, they belong to phosphoric di-ester that is their bridge linkage group.

遗传物质DNA和RNA是磷酸二酯，磷酸酯基团是连接核酸的桥连基团。

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