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09-10分子生物學期末試卷答案(編輯修改稿)

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【文章內容簡介】 gation of the lagging strand during DNA synthesis:A. In the 3’5’ directionB. Produces Okazaki fragments C. Polymerizes into the direction of fork movementD. Does not require a template strand（ C ）Telomeres are found at the end of chromosomes and they are synthesized by telomerase. Which one of the following statements is correct?A. The function of telomerase is 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。end of E. coli 16S rRNAB. base pa

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