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24.(13分)([文]1)cDNA(1分[章])cDNA文库中没[来]有内含子(1分),[自]大肠杆菌是原核生物[知],其基因结构与cD[嘛]NA结构更接近(1[答]分)DNA聚合酶不[案]能从头开始合成DN[网]A,而只能从3端延[文]伸DNA链(2分)[章]提供反应所需的原料[来]和能量(2分,全对[自]才给分)(2)无菌[知]水(1分)未发生([嘛]1分)(3)抗性菌[答]增殖,降解了CRO[案],使营养菌能存活并[网]增殖(2分):营养[文]菌增殖,分解乳糖,[章]代谢产物为抗性菌生[来]长提供碳源(2分)[自]
第一节Dear Mr GeorgeI am Li Hua, a volunteer[知] of the activity"Englishi Communica[嘛]tion to the Mountains[答]". Now, I'm writing toexpress[案] my sincere apology to you for not being present atthe activity to be held next Monday.Th[网]e reason for my absence is that I suddenly fell illMy parents sent me to hospital,[文] and I have to stay therefor a week. As for my volunteer[章] work, I have asked myclassma[来]te Tom to do it.Sincer[自]ely hoping that you can accept my apologies[知]Yours.Li Hua
