09-10分子生物學(xué)期末試卷答案-預(yù)覽頁(yè)
【正文】 to directly elongate the leading strand during DNA replication.B. Telomers code for ribosomal RNA.C. Telomerase is an unusual enzyme made up of RNA template and protein.D. Telomerase is active in all cell types.（ C ）Which of the following is correct concerning transcription and DNA replication?A. Only transcription requires a primer.B. Transcription starts at the origin of replication.C. In DNA replication, both the coding and template strands are copied.D. The entire genome is copied in transcription.（ D ）Which of the following statements describes a similarity between the structure of DNA and RNA? In both DNA and RNA, A. the nitrogenous base uracil is found.B. there is a hexose sugar.C. the carbon 2’ has an hydroxyl group.D. the nitrogenous base is attached to carbon 1’.（ D ）Regulation of the trytophan operon involvesA. repression (at an operator) B. attenuationC. the concentration of free trytophan D. all of the above（ B ）Which of the following is not stop codon? A. TAA B. TAT C. TAG D. TGA（ A ）The ShineDalgarno sequence in mRNAsA. base pairs to the 339。DNA能準(zhǔn)確地自我復(fù)制（1分），并把遺傳信息轉(zhuǎn)錄到mRNA分子上（1分），然后通過(guò)mRNA翻譯成為具有特定氨基酸順序的蛋白質(zhì)（1分），由蛋白質(zhì)行使各種生物學(xué)功能。 DNA RNA 蛋白質(zhì) （2分）What is the operon? How the lac operon controls gene expression?（8 points）操縱子是原核生物基因表達(dá)調(diào)控的單位（1分），包括啟動(dòng)子、操縱基因和一系列功能上相關(guān)的結(jié)構(gòu)基因（1分）。(2分)cDNA文庫(kù)：以mRNA為模板，經(jīng)反轉(zhuǎn)錄酶催化，在體外反轉(zhuǎn)錄成cDNA，與適當(dāng)?shù)妮d體（常用噬菌體或質(zhì)粒載體）連接后轉(zhuǎn)化受體菌，則每個(gè)細(xì)菌含有一段cDNA，并能繁殖擴(kuò)增，這樣包含著細(xì)胞全部mRNA信息的cDNA克隆集合稱為該組織細(xì)胞的cDNA文庫(kù)。（3分）8 / 8
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