郑雪松基因工程Keys for the problems.docVIP

Keys for Chapter 2 The codon of tRNA is complementary to the anticodon of mRNA. 一的密码子是互补的反密码子mRNA A) True B) False DNA replication can begin at any site along the DNA molecule. DNA复制可以在任何网站开始沿着DNA分子。 A) True B) False Synthesis of a new strand of messenger RNA is in the 5 to 3 direction. 合成新的信使RNA链的5‘3’方向发展。 A) True B) False The segment of the DNA molecule where messenger RNA synthesis begins is called the... 段的DNA分子信使RNA合成开始被称为… A) promoter region. 启动子区 B) sigma factor. σ 因子C) transcription terminator.转录终结者 D) polymerase.聚合酶 E) template.模板 5. The complimentary messenger RNA strand that would be synthesized from the DNA base sequence of CTGAC would be... 将合成的免费信使RNA链的DNA碱基序列CTGAC会…… A) GACTG B) UGACU C) AGTUG D) GACUG E) GACGU The name of the structure that causes the synthesis of RNA to cease（停止；结束）is called the... 结构的名称,使RNA的合成停止称为… A) promoter region B) sigma factor C) transcription terminator D) polymerase E) template 7. Synthesis of mRNA is 信使核糖核酸的合成是 A) in the 5 to 3 direction with new nucleotides being added to the 5 end of the mRNA molecule. B) in the 3 to 5 direction with new nucleotides being added to the 5 end of the mRNA molecule. C) in the 5 to 3 direction with new nucleotides being added to the 3 end of the mRNA molecule. 5 - 3的方向与新的核苷酸被添加到的3 端mRNA分子。 D) in the 3 to 5 direction with new nucleotides being added to the 3 end of the mRNA molecule. E) able to proceed either from the 5 to 3 or 3 to 5 direction. 8. The model of DNA double helix was deduced by James Watson and Francis Crick in _1953_, which set up the foundation of the molecular biology. DNA双螺旋结构的模型,推导出由詹姆斯·沃森和弗朗西斯·克里克_1953_,建立分子生物学的基础。 9. Ahead of the replication fork the DNA becomes supercoiled, which needs to be relieved or tension would build up (like coiling as spring) and block fork progression. The enzyme relievi