题目内容

对大多数基因来说，CpG序列甲基化对基因表达的影响是

A. 促进基因表达
B. 抑制基因转录
C. 无影响
D. 促进蛋白质翻译

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转录因子常见的DNA结合结构域包括

A. 锌指模体结构
B. 碱性螺旋-环-螺旋模体结构
C. 碱性亮氨酸拉链模体结构
D. 酸性氨基酸结构域

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

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.______