2020到2022年英语周报第四期北师大版高三答案

显时,将培养的供体细胞导入受体细胞需用到的操作是解析:(1)在进行动物细胞培养时,首先要将新鲜取材的动物组织剪碎,用胰蛋白酶或胶原蛋白段时间,以分散成单个细胞,制成细胞悬液。(2)动物细胞培养时,为达到无菌、无毒的环境条件,除了要对培养液和培养器具进行及在无菌环境下进行操作外,另外还应定期更换培养液,以便清除代谢产物,防止积累对细胞自身造成危害。气体环境中CO2的作用是维持培养液的pH。(3)在单克隆抗体的制备过程中,与骨髓瘤细胞融合的是已经免疫的B淋巴细胞。在总高考·广过程中,常用的化学诱导剂是聚乙二醇(PEG);筛选出的杂交瘤细胞所具有的特点是可在件下无限增殖,又能分泌所需抗体东将培养的供体细胞导入受体细胞需用到显微注射技术。除桥注外,每空2分高分剪碎,用胰蛋白酶或胶原蛋白酶处理一段时间2)无菌无毒环境、适宜的温度和pH、必需的营养、适宜的气体环境等防止细胞代谢产物积累动物细胞的生长和增殖(答案合理即可)维持培养液的pH(1分)和(3)(已免疫的)B淋巴细胞和骨髓瘤细胞聚乙二醇(PEG)(1分)既能无限增殖,又能分泌所抗体(1分4)显微注射(1分)

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

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