【单选题】H e didn’t keep on asking me for a ride any longer as he had already got his own car .
【单选题】下列关于动物细胞培养的叙述,正确的是()
D.
原代培养的动物细胞一般传代至10代左右就不容易传下去了,但极少数细胞可度过这次“危机”,这种传代细胞可无限传代
【单选题】He didn’t keep on asking me the time any longer as he had had his watch ______.
【单选题】下列关于动物细胞培养的叙述,不正确的是 [ ]
B.
在原代培养过程中,细胞在培养液中悬浮生长和增殖
D.
动物细胞培养时用CO 2 培养箱维持适宜的pH
【单选题】在美国历史上,向宪法做出最大挑战的总统大概是( )。
【单选题】下列有关动物细胞培养的叙述不正确的是()
B.
动物细胞培养前要用胰蛋白酶使细胞分散,制备细胞悬浮液
D.
目前使用的或冷冻保存的正常细胞通常为10代以内的,以保持其正常核型
【单选题】(附加题)下列关于现代生物科技专题知识的叙述,正确的是 [ ]
B.
植物组织培养中乙烯和细胞分裂素的配比会影响组织分化
C.
转入油菜的抗除草剂基因,不可能通过花粉传入环境造成基因污染
D.
植物有性杂交和体细胞杂交均能克服远源杂交不亲和的障碍
【简答题】He never believed that true love existed. His parents divorcedwhen he was young and he didn’t think that true love was able to survive in today’s world. He was 36 wrong. His grandparents were always s...
【单选题】He didn’t think that the news was true, ___ ?
【简答题】I great difficulties in learning English grammar. 2. He managed to persuade his parents to let him a job. 3. The sofa as a bed at night. 4. I didn’t know how to these people 5. It was a that she died ...