A:胰蛋白酶将动物细胞膜表面的糖蛋白去掉,细胞黏着性降低,细胞散开
B:在培养液中添加抗生素,以便清除代谢产物
C:培养基应置于5%的CO2中,CO2使培养基的pH值维持在7.2~7.4
D:单克隆抗体制备过程中,第一次筛选是为了获取产生特异性抗体的细胞
词汇运用⑴No one is____ (允许)to drive after drinking.⑵As soon as I arrived in Hong Kong, I sent a ____ (信息)to Mum.⑶About two hundred people ____ ( 死 )in Ya'an Earthquake on April 20th .⑷The moon light shines in ____(通过) the window and the room seems quiet and beautiful.⑸The teacher spent a long time ____ (解释)the problem to the boys after class.⑹Now Father's Day becomes very popular. It is on the ____ (three) Sunday every June.⑺Teenagers should be encouraged to make decisions by ____ (they).⑻It's much ____ (sun) this weekend. Why not go camping, David? ——Sounds great.⑼Everyone likes Mary in our class because she always talks to others____ (polite).⑽The telephone was one of the most important ____ (invent) of the 19th century.
化学符号
____
2Na
化学含义
3个氢分子
+3价的铝元素