问题 单项选择题

下图表示糖类的化学组成和种类,相关叙述正确的是()

A.①、②、③依次代表单糖、二糖、多糖,它们均可继续水解

B.①、②均属还原糖,在加热条件下与斐林试剂发生反应将产生砖红色沉淀

C.④、⑤分别为纤维素、肌糖原,二者均贮存能量,可作为贮能物质

D.④是植物细胞壁的主要成分,使用纤维素酶可将其破坏

答案

参考答案:D

解析:

据图可知,①、②、③分别代表单糖、二糖、多糖,其中二糖和多糖可以水解,A错误;二糖中的蔗糖不是还原性糖,B错误;动物中的多糖为肝糖原和肌糖原⑤,植物中的纤维素不能提供能量,C错误;植物中的多糖是淀粉和④纤维素,其中纤维素是构成细胞壁的成分之一,可被纤维素酶分解,D正确。

考点:本题主要考查糖的种类,意在考查考生能理解所学知识的要点,把握知识间的内在联系,形成知识的网络结构的能力

阅读理解

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