问答题黏粒载体具有哪些特点与不足?

问答题脂肪动员

问答题SH2结构域

问答题甘油磷脂与鞘糖脂

问答题Directions: You are about to graduate from a university in the coming month. Right now you are doing some job hunting. Write a letter of application to an American bank in your city to 1) introduce yourself briefly and 2) express your wish to join the company. You should write about 100 words on ANSWER SHEET. Do not sign your own name at the end of the letter. Use "Li Ming" instead. You don't have to write the address.

问答题用哪两种方法可以连接钝端片段?

问答题复制子，复制叉

问答题酶及其辅助因子是指什么?简述它们之间的关系。

问答题M13载体(M13 vector)

问答题染色体步移(chromosome walking)

问答题已知真核生物的核糖体由4种rRNA和80多种不同的核糖体蛋白组成，为什么真核生物细胞内rRNA的基因拷贝数远多于核糖体蛋白的基因?

问答题溶菌酶是破碎细菌细胞的有效方法，但有些细菌的芽孢对溶菌酶不敏感，应该如何处理?

问答题什么是随机引物(random primer)?如何标记DNA?

问答题列举一个已知的DNA序列编码一种以上蛋白质的三种方法。

问答题前导序列(1eadersequence)

问答题请计算18：1的油酸进行β氧化所产生的ATP数量，并写出具体步骤。

问答题Geneticcode

问答题间隔DNA(spacer DNA)

问答题人GM-CSF是由127个氨基酸组成的生长因子，能够调节成熟的粒细胞和巨噬细胞的生物功能，GM-CSF能够治疗髓性再生障碍、粒白细胞低下、化学治疗或放射治疗引起的骨髓造血抑制等疾病治疗药物。人GM-CSFcDNA编码序列中G／C含量为81．5％。本实验室拟用大肠杆菌为表达体系，构建重组人GM-CSF高效表达菌株，以实现GM-CSF的基因工程生产。请你设计实验流程，实现人GM-CSF的高效表达和验证，并请简要注明各关建流程环节的目的或依据。

问答题Children in any society are expected to learn to conform to a number of social rules and expectations if they are to become participants in the culture. (46)Among the rules that children in our society are expected to learn are that certain classes of adults (such as teachers and doctors) are addressed by titles, that males and females use separate restroom facilities, and that women but not men wear dresses. These are examples of social conventions. In the absence of such a shared norm, the acts are neither right nor wrong. For this reason, conventions may be said to be arbitrary. For example, (47)we could just as easily have students address teachers by first names as have them call teachers by their last names and formal titles of Mr. or Ms. Conventions, however, serve an important function by providing predictability and order to social life. (48)Without social conventions it would be impossible to organize social institutions such as schools, and societies as organized systems could not exist. The arbitrariness of conventions makes their importance difficult for children to figure out. (49) It is not until some time in adolescence that children come to fully understand the function that these arbitrary conventions serve to provide predictability and order to our social interactions. In contrast with issues of convention are matters of morality. Morality refers to issues of human welfare, justice, and rights that are a function of the inherent features of interpersonal relations. Because of this, the right and wrong of moral actions are not simply determined by social consensus or the views of authority. For example, it is not possible to hit another person with force and not hurt the other person. Similarly, it is not possible to steal something valuable from someone else and not cause the person to experience the sense of loss. A moral judgment about unprovoked harm ( "It is wrong to hit") would not be dependent on the existence of a socially agreed upon rule or standard but could be generated solely from the intrinsic effects of the act (i.e., hitting hurts). (50)Similar analyses could be done regarding a broader range of issues that would extend beyond direct harm to concerns for what it means to be just, compassionate, and considerate of the rights of others.