问题
单项选择题
若用DNA酶处理S型肺炎双球菌的DNA,再使其与活的R型肺炎双球菌(无毒性)一起感染小鼠,结果是()
A.小鼠不死亡
B.从小鼠体内可分离得到S型活菌
C.小鼠死亡
D.从小鼠体内可分离得到S型菌的DNA
答案
参考答案:A
若用DNA酶处理S型肺炎双球菌的DNA,再使其与活的R型肺炎双球菌(无毒性)一起感染小鼠,结果是()
A.小鼠不死亡
B.从小鼠体内可分离得到S型活菌
C.小鼠死亡
D.从小鼠体内可分离得到S型菌的DNA
参考答案:A
补全对话(选择正确答案的序号填入横线上) A: 小题1:_______________________. B: Why do you like to see pandas? A: 小题2:________________________. B: 小题3:________________________? A: I like to see elephants, too. Because they can dance. B: Really? 小题4:____________. By the way, do you want to be an assistant in the zoo? A: Well, to work for animals is interesting, but kind of dangerous. I don’t like it. B: 小题5:_________________________? A: I want to be a reporter. I can meet many famous (著名的) people.
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