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A-Level生物考试关于淀粉如何分类的介绍

2019-08-15 1274浏览

　　在A-Level生物考试中，其实不少知识点都来源自生活中，比如淀粉就是无处不在，很多食物中都含有淀粉，比如玉米、马铃薯等，那么你对淀粉的知识了解吗？本文就为大家介绍A-Level考试生物知识点淀粉的分类问题，一起来看。

　　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，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.

　　怎么样，看了上文的介绍，你对淀粉的分类有了解了吗？有时候A-Level考试的知识点与现实很接近，因此大家平时要多注意观察和积累，本文关于A-Level生物考试知识点淀粉的分类就介绍到这里了，了解alevel考试费用、alevel真题等相关问题，可咨询在线客服。