freepeople性欧美熟妇, 色戒完整版无删减158分钟hd, 无码精品国产vα在线观看DVD, 丰满少妇伦精品无码专区在线观看,艾栗栗与纹身男宾馆3p50分钟,国产AV片在线观看,黑人与美女高潮,18岁女RAPPERDISSSUBS,国产手机在机看影片

正文內(nèi)容

09-10分子生物學(xué)期末試卷答案-wenkub.com

2025-06-19 12:54 本頁(yè)面
   

【正文】 cDNA文庫(kù)顯然比基因組DNA文庫(kù)小得多,能夠比較容易從中篩選克隆得到細(xì)胞特異表達(dá)的基因。(1分)What are the characters of expression vectors?(5 points)(1)能夠進(jìn)行獨(dú)立于基因組的自我復(fù)制 (1分)(2)容易從細(xì)胞中分離提取 (1分)(3)含有多克隆位點(diǎn),允許外源片段的插入 (1分)(4)含有至少一個(gè)選擇標(biāo)記 (1分)(5)具有啟動(dòng)子、終止子等表達(dá)元件 (1分)Please illuminate the function of the cap structure of mature mRNA in 5’emd.(5 points) (1) 對(duì)5’外切核酸酶形成屏障,保護(hù)和穩(wěn)定轉(zhuǎn)錄產(chǎn)物(2分) (2) 有助于前體mRNA的剪接和轉(zhuǎn)運(yùn)到細(xì)胞質(zhì)(2分) (3) 提高翻譯的效率(1分)Please illuminate the difference between the initial tRNA molecule and the tRNAMet in elongation in . (5 points)(1)只有起始tRNA分子的蛋氨酸甲?;羌柞;膄mettRNA也能起始,但效率不高,因?yàn)榧柞;桥ctRNA分子結(jié)合的起始因IF2的識(shí)別標(biāo)志(2分)(2)tRNA分子氨基酸接受臂末端的配對(duì)堿基在起始tRNA分子中是不配對(duì),這阻止起始tRNA參與延伸,同時(shí)這種不配對(duì)特性也是甲?;磻?yīng)中甲?;缸R(shí)別必需的(2分)(3)反密碼子環(huán)莖連續(xù)3個(gè)GC堿基對(duì)是起始tRNA分子所特有的,也是起始tRNA分子插入核糖體P位點(diǎn)必需的(1分)Please illuminate the difference between the genome library and cDNA library.(7 points)DNA文庫(kù):將某種生物的基因組DNA切割成一定大小的片段,并與合適的載體重組后導(dǎo)入宿主細(xì)胞進(jìn)行克隆。后來(lái)人們又發(fā)現(xiàn)反轉(zhuǎn)錄病毒可以其RNA作為模板指導(dǎo)合成DNA(1分);某些病毒RNA可以進(jìn)行自我復(fù)制,即以自身RNA為模板,合成子代RNA(1分)。end of E. coli 16S rRNAC. has a consensus sequence of YNCURACD. is located just downstream of the initiation codon ( C )1Which of the following is not bound to the aminoacyltRNA synthetase? A. amino acid B. tRNA C. GTP D. ATP ( D )1The ribosome scanning model for translation was proposed byA. P. Sharp B. R. RobertsC. T. Cech D. M. Kozak( D )1Most nuclear mRNA introns begin with _________ and end with __________. A. U, G B. GU, NG C. AG, GU D. GU, AG ( A )1Which of the following is the covalent l
點(diǎn)擊復(fù)制文檔內(nèi)容
化學(xué)相關(guān)推薦
文庫(kù)吧 www.dybbs8.com
備案圖片鄂ICP備17016276號(hào)-1