问题
选择题
细胞工程中，选择合适的生物材料是成功的关键。下列选择不合理的是[ ]
A．选择高度分化的动物体细胞进行培养有利于获得大量细胞
B．选择胚胎细胞作为核供体进行核移植可提高克隆动物的成功率
C．选择一定大小的植物茎尖进行组织培养可获得脱毒苗
D．选择植物的愈伤组织进行诱变处理可获得优质的突变体
答案
答案：A
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细胞工程中，选择合适的生物材料是成功的关键。下列选择不合理的是[ ]
A．选择高度分化的动物体细胞进行培养有利于获得大量细胞
B．选择胚胎细胞作为核供体进行核移植可提高克隆动物的成功率
C．选择一定大小的植物茎尖进行组织培养可获得脱毒苗
D．选择植物的愈伤组织进行诱变处理可获得优质的突变体
答案：A
| 用方框中所给词汇的适当形式完成句子或对话 | |
2. -Pizza is very popular in Italy. -Yes, I __________. 3. -__________. Can you tell me the way to the library? 4. -Can I have something to eat? -No, you mustn't eat anything __________ you see the doctor. 5. __________ I grow up, I'll be a nurse and look after patients. 6. Henry Norman Bethune __________ in Canada in 1890. 7. You are so careless, __________ you'll have an accident. 8. You __________ get up earlier tomorrow. Or you can't catch the first bus. 9. Paul's uncle __________ a lot and he has cancer. 10. Tom is too young to look after __________. |