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alevel课程生物学知识点淀粉类介绍

  • 责任编辑:siyu.zhang
  • 来源:互联网
  • 时间:2020-05-26 11:12:12

  alevel课程大家应该都了解,但你是否清楚alevel生物学的情况呢?今天就和天道教育小编一起看看alevel生物学课程的知识点,希望对各位有所帮助。

  民以食为天,淀粉作为食物的重要组成部分,对于我们每个人来说并不陌生,日常生活中我们经常食用玉米淀粉,马铃薯淀粉等。那你知道生物中的alevel生物学课程淀粉是如何分类的吗?

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

  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,alevel生物学淀粉也是多糖。

  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.

  alevel课程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.

  以上就是生物学alevel课程的情况介绍了,希望对各位学子学好alevel生物学有所帮助,如果你对alevel生物学课程还有其他疑问,敬请关注天道教育alevel考试频道。

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