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核苷和核苷酸 Nucleosides and nucleotides： 核苷(Nucleoside)是含氮碱基与糖组分缩合成的糖苷，由碱基和五碳糖连接而成，即嘌呤的N-9或嘧啶的N-1与核糖或脱氧核糖的C-1通过β糖苷键连接而成的化合物，包括核糖核苷和脱氧核糖核苷两类。 由D-核糖生成的核苷称核糖核苷，参与RNA组成，由D-α-脱氧核糖生成的核苷称脱氧核糖核苷，参与DNA组成。 核苷酸是一类由嘌呤碱或嘧啶碱、核糖或脱氧核糖以及磷酸三种物质组成的化合物，核苷酸主要参与构成核酸，许多单核苷酸也具有多种重要的生物学功能，如与能量代谢有关的三磷酸腺苷（ATP）、脱氢辅酶等。此外，核苷酸在调味料、食品添加剂、医疗医药、母婴用品均有广泛的应用。
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