SAT2生物核心概念：糖.

　　SAT2生物考試是很多參加SAT2考試的考生參加的一個科目，對于SAT2生物備考來說，記憶并且理解一些核心概念是提高效率的好方法。下面就為大家搜集整理了關(guān)于SAT2生物核心概念的一些備考資料，供大家參考。

　　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，這些二聚體是由兩個單體脫水縮合形成。任何兩個單糖可以形成一個糖。舉例來說，麥芽糖是由脫水合成二葡萄糖分子。蔗糖，淀粉，是由葡萄糖和果糖組成的。

　　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

　　多糖可以構(gòu)成多達數(shù)千種。根據(jù)其結(jié)構(gòu)和它們含有單糖，多糖的所具有的功能，所以多糖可以儲存過剩的能源或提供結(jié)構(gòu)性支持。

　　當細胞攝取碳水化合物比他們需要消耗的多時，他們鏈接起來在一起，形成多糖結(jié)構(gòu)，植物和動物的多糖不相同：在植物中，多糖存在形式是淀粉，而在動物，他們鏈接一起后存在形式是糖元。

　　多糖也可以有結(jié)構(gòu)性的角色，在植物和動物。在植物細胞中纖維素構(gòu)成細胞壁，纖維素就是是一個結(jié)構(gòu)性的多糖。在動物方面，多糖甲殼素形式鎧甲如昆蟲，螃蟹，蜘蛛，和其他節(jié)肢動物的殼。許多真菌也利用甲殼素作為一個結(jié)構(gòu)性碳水化合物。

　　以上就是關(guān)于SAT2備考核心概念的糖的相關(guān)信息，包括了兩種關(guān)于生物體內(nèi)的糖的種類的中英文描述，非常詳細。大家可以在自己備考SAT2生物考試的時候，參考一下上面的概念。