SAT2生物核心概念：糖.

2017-08-06 作者： 92阅读

　　SAT2生物考试是很多参加SAT2考试的考生参加的一个科目，对于SAT2生物备考来说，记忆并且理解一些核心概念是提高效率的好方法。下面就为大家搜集整理了关于SAT2生物核心概念的一些备考资料，供大家参考。

　　Disaccharides

　　Disaccharides are carbohydrate dimmers. These dimmers are formed from two monomers by dehydration synthesis. Any two monosaccharides can form a disaccharide. For example, maltose is formed by the dehydration synthesis of two glucose molecules. Sucrose, common table sugar, comes from the linkage of one molecule of glucose and one of fructose.

　　二糖

　　二糖化合物，这些二聚体是由两个单体脱水缩合形成。任何两个单糖可以形成一个糖。举例来说，麦芽糖是由脱水合成二葡萄糖分子。蔗糖，淀粉，是由葡萄糖和果糖组成的。

　　Polysaccharides

　　Polysaccharides can consist of as few as three and as many as several thousand monosaccharide. Depending on their structure and the monosaccharide they contain, polysaccharides can function as a means of storing excess energy or provide structural support.

　　When cells ingest more carbohydrates than they need for fuel, they link the sugars together to form polysaccharides. The structure of these polysaccharides is different in plants and animals: in plants, polysaccharides take the form of starch, whereas in animals, they are linked in a structure called glycogen.

　　Polysaccharides can also have structural roles in plants and animals. Cellulose, which forms the cell walls of plant cells, is a structural polysaccharide. In animals, the polysaccharide chitin forms the hard outer armor of insects, crabs, spiders, and other arthropods. Many fungi also use chitin as a structural carbohydrate.

　　多糖

　　多糖可以构成多达数千种。根据其结构和它们含有单糖，多糖的所具有的功能，所以多糖可以储存过剩的能源或提供结构性支持。

　　当细胞摄取碳水化合物比他们需要消耗的多时，他们链接起来在一起，形成多糖结构，植物和动物的多糖不相同：在植物中，多糖存在形式是淀粉，而在动物，他们链接一起后存在形式是糖元。

　　多糖也可以有结构性的角色，在植物和动物。在植物细胞中纤维素构成细胞壁，纤维素就是是一个结构性的多糖。在动物方面，多糖甲壳素形式铠甲如昆虫，螃蟹，蜘蛛，和其他节肢动物的壳。许多真菌也利用甲壳素作为一个结构性碳水化合物。

　　以上就是关于SAT2备考核心概念的糖的相关信息，包括了两种关于生物体内的糖的种类的中英文描述，非常详细。大家可以在自己备考SAT2生物考试的时候，参考一下上面的概念。