[单项选择]在LDL受体叙述中错误的是 A. LDL受体配体结合结构域也称ApoB100E受体 B. LDL受体只能在ApoE存在的情况下可以结合LDL C. LDL受体可以结合LDL D. LDL受体在ApoE存在的情况既可以结合LDL，又可以结合VLDL E. LDL受体主要功能是通过摄取Ch进入细胞内
第17题: [简答题]Topic A WHAT IS IMPORTANT WHEN… Choosing a computer skills course · Topics · Size of group · Qualification offered
参考答案:Suggested Ideas： Topics： You probably need to consider the following： · Whether the topics of the course are related to your needs(For example，if you work as a secretary and you are only good at using Word of Microsoft Window’s programs for office and you want to improve you skills of using Excel and Power Point，but the topics of the course are mainly to train peopie how to use computer programs for making financial statements and balance sheets，then this course will not be suitable for you．However，it will be very useful for some one who works as an accounts clerk or assistant to a financial analyst)． · Whether the topics of the course are interesting so that you will not get bored after joining the course． Size of group： You probably need to consider the following： · It should not be too large．If the size of group is too large，it will be difficult for the trainer/instructor of the course to manage．to pay enough attention to every trainee or to accommodate all trainees’ needs and requirements． · It should not be too small either．If the size of group is too small，the interaction among the traineesmore，the cost of the course will be greatly increased． Qualification offered： You probably need to consider the following： · What kind of qualification will be offered．whether it is domestically or internationally recognized． · Whether an authoritative certificate will be awarded to the trainees who pass the final assessment of the course． · Whether such certificates will be accepted by employers．
第35题: [单项选择]数据库管理系统提供的DDL语言的功能是( )。 A. 实现对数据库的检索、插入、修改与删除 B. 描述数据库的结构和为用户建立数据库提供手段 C. 用于数据的安全性控制、完善性控制和并发控制 D. 提供数据初始装入、数据转储、数据库恢复和数据库重新组织等手段 参考答案:B 答案解析:[解析] 数据库管理系统提供的DDL的功能是数据定义功能，描述数据库的结构和为用户建立数据库提供手段，故本题选择B：选项A是数据操作功能；选项C是数据库的运行管理功能；选项D是数据库的建立和维护功能。
第36题: [单项选择]有一混合蛋白质溶液，各种蛋白质的pI分别为4.5、5.2、5.3、6.6、7.2，电泳时欲使其中3种泳向正极，缓冲液的pH应该是多少 A. 2.0 B. 5.0 C. 7.0 D. 6.0 E. 9.0 参考答案:D 答案解析:本题考查蛋白质等电点有关概念，当溶液的pH低于蛋白质等电点时，蛋白质分子带正电荷成为阳离子；当溶液pH大于等电点时，蛋白质分子带负电荷，成为阴离子。电泳时欲使其中3种泳向正极，缓冲液的pH大于其中3种
