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A-Level生物考试你知道淀粉的分类吗?

2019-08-02 11:20:48 156人已读 分享到

  A-Level生物考试该如何备考?相信每位考生都有他自己的方法,但是万变不离其宗,考生备考离不开对生物知识点的学习,而A-Level生物考试中,有时候会考到一些在生活中常见的东西,比如淀粉。本文就为大家介绍一下A-Level生物考试淀粉的相关知识点,希望对大家有所帮助。

  A starch is a complex polysaccharide made up of a large number of glucose as monomeric units joined together by glycosidic bonds.


A-Level生物考试你知道淀粉的分类吗?


  Starch(淀粉): 是葡萄糖分子聚合而成的,它是细胞中碳水化合物最普遍的储藏形式。

  Starch is long chains of sugar molecules linked together like a chain. A single sugar molecule is a monosaccharide.

  淀粉是由葡萄糖分子链接而成的长链。一个葡萄糖分子被称为单糖。

  Many sugar molecules linked together is a polysaccharide.

  Starch, therefore, is a polysaccharide.

  有很多葡萄糖分子连接而成的糖被称为多糖,淀粉也是多糖。

  Chemical Formula of Starch:

  Starch is a chain of glucose molecules, but the chain isn't always straight. Sometimes, the sugar molecules branch off from the main chain and form their own, just like a tree has a main trunk and then branches. As such, starch actually has two forms: one form has no branches while the other form does.

  淀粉是葡萄糖分子链构成的长链,但是长链不是总是直的,它也有很多支链就像树一样。淀粉一般有两种形式:支链淀粉和直链淀粉,我们来看一下到底有什么区别?

  The branchless form is amylose.(直链淀粉)

  Amylose is an unbranched chain of glucose molecules joined by 1, 4 glycosidic bonds, as a result of that amylose is coiled and thus it is very compact molecule meaning it can store a lot of energy.

  The branched form is Amylopectin.(支链淀粉)

  Amylopectin is branched and is made up of glucose molecules joined by 1, 4 and 1,6 glycosidic bonds, due to the presence of many side branches it is rapidly digested by enzymes therefore energy is released quickly. It is also a compact molecule.

  以上就是本文有关A-Level生物考试淀粉相关知识点的介绍了,看完后你有没有收获呢?了解更多alevel经济考试原题、alevel考试局比较等方面的内容,可咨询在线客服。最后小编也祝大家都能在考试中取得好成绩!

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