题目内容

管家基因的表达特性是

A. 通常表达水平较低
B. 通常表达水平较高
C. 其表达较少受环境变化影响
D. 在生物体各生长阶段的几乎全部组织中持续表达

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基因表达调控的生物学意义包括

A. 适应环境
B. 维持生长和细胞分裂
C. 维持细胞分化
D. 维持生长发育

Imagine you are writing your term paper. You’re just received a very useful reference book as a gift from Professor Smith. You meet him and express your thanks. Read aloud the following dialogue with your partner by filling in the missing words.You: Good morning, Prof. Smith. 1._____for the book you sent me. It is 2._ to myterm paper.Smith: 3._it is helpful to you.You: Yes, it’s indeed a very good reference book. I don’t know how I shall express 4._.Smith: It’s 5._.You: And I’m 6.for all the help and encouragement you’ve given me.Smith: I’m happy to be 7._ . Please don’t hesitate to let me know whenever you need help.You: I will, Prof. Smith. You are so 8. .1.2.3.4.5.6.7.8.______

_______是存储在计算机内有结构的数据的集合。

A. 数据结构DataStructure
B. 数据库Database
C. 数据库管理系统DBMS
D. 数据库系统DBS

下列选项中，关于Data、Database、DBMS和DBS这四个概念说法不正确的是________。

A. Database中存储了大量的Data

B. DBMS用于管理Database

C. DBMS中包括了Database和Data

DBS中包括了Data、Database和DBMS