2022英语周报高二课标zjz第一期答案

书面表达Dear Sir or MadamI am Li Hus, an exchenge student from China. Wanting to get a library card in your library.(背景2分)1 am writing to ask for some relvant information.(目的3分)to begin with, could you please tell me what kind of books can beborrowed?(要点一6分) besides, I would be very interested to ksomething about borrowing system, including how long I can keep thebooks, how many books I can borrow once, and how much I should pay(要点二6分)L8 t but not least, I also wonder when and where I canmake it.(要点三6分)a中aThanks for your ime and I would appreciate it if you can give an earlreply.(表感谢+期回复2分)1量里的0+Yoour sincere.yLi H点国惊口人国文

38.(15分)(1)对培养皿和所有培养用具进行无菌处理;在培养液中添加一定量的抗生素;定期更换培养液(每点1分,共3分)(2)减数第二次分裂中(或MⅡ中,2分)避免取核过程对细胞核造成损伤(2分)(3)促进(或激活)细胞核全能性表达的物质(2分)(4)胚胎移植(2分)同期发情(2分)使供、受体生殖器官的生理变化相同,为供体的胚胎移入受体提供相同的生理环境(2【解析】(1)保证无菌无毒环境的具体操作有对培养皿和所有培养用具进行无菌处理;在培养液中添加一定量的抗生素;定期更换培养液。(2)核移植前需将来自供体猫的卵母细胞培养至减数第二次分裂中期,从细胞水平分析,与取猫“大蒜”体细胞的细胞核进行移植相比,直接将猫“大蒜”的体细胞注人去核卵母细胞可以避免取核过程对细胞核造成损伤。(3)卵母细胞因具有体积大、易操作、营养物质丰富、含有促进(或激活)细胞核全能性表达的物质等特点,而常常被用作细胞核移植时的受体细胞(4)④为胚胎移植,胚胎移植前要用激素处理,让代孕猫与供体猫同期发情,使其生殖器官的生理变化相同,为供体的胚胎移入受体提供相同的生理环境

以上就是2022英语周报高二课标zjz第一期答案，更多英语周报答案请关注本网站。