一、蛋白质的定义 蛋白质(protein,简写pro):是由20种L-a-氨基 酸按一定的序列通过酰胺键(肽键)缩合而成的, 具较稳定构象并具一定生物功能的生物大分子。 Protein一词来自希腊文“Proteios”,意即“第 一位的”、“最重要的”。 18世纪 Beccari中叶首次报道应用稀酸、稀碱核 盐类可从动、植物组织中分离到含氮类物质。 1838年荷兰Mulder化学家将之应用于从动植物 细胞中所发现的复杂的有机含氮化合物。 蛋白质是一类含氮的生物高分子,分子量大,结 构复杂

Structure Analysis Central topic: Time-conscious Americans (\Time is one of the two elements that Americans save carefully, the other being laborpara.1)

Cytoplasmic Membrane System or Cytomembranes Internal Membrane or Endomembrane System(EMS) Includes: nuclear envelopes, endoplasmic reticulum (ER), Golgi complex(GC), lysosomes and a variety of vesicles or vacuoles. Although each of these membranous organelles has its own distinct structure

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Part I Vocabulary and structure 30% A: Make the best choice: 1. She was able to cope ---- the difficulties she met with a. in b with d

Part I Vocabulary& Structure(20%) Section A 1. IfI _you, I would not do it. A.was B.am C.were D. be

Part I Structure(30%) Directions: In this section, there are 20 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A), B), C and D). Then you should mark the corresponding letter on the Answer Sheet with the size of the whole earth, the highest mountain does not seem high at all

Part I Vocabulary Structure(20%) Section a employee C. calculator D. device

Part I Vocabulary Structure(20%) Section a I. Ben was quite stubborn and it was almost impossible to him of his mistakes B. recognize C. forget D. convince

Unit 1.Price I. Basic knowledge of pricing 1.Cost structure: cost of production, selling and delivery costs, taxes and tariffs a. Cost of production Costs related to the product manufacture: labor, raw materials