问题
单项选择题
赫尔希和蔡斯的噬菌体侵染大肠杆菌实验,证明了()
A.蛋白质是遗传物质
B.DNA是遗传物质
C.糖类是遗传物质
D.RNA是遗传物质
答案
参考答案:B
解析:
噬菌体侵染细菌的实验:
赫尔希和蔡斯的噬菌体侵染大肠杆菌实验,证明了()
A.蛋白质是遗传物质
B.DNA是遗传物质
C.糖类是遗传物质
D.RNA是遗传物质
参考答案:B
解析:
噬菌体侵染细菌的实验:
从方框内选出短语,并用其适当形式填空。 | |
1. Jenny likes to eat lots of fruits, _________ bananas and oranges. 2. I want to be a teacher _________ a scientist in the future. 3. The two runners took different routes, but they both_______ in the same place. 4. When I_______ this morning, it was already nine o’ clock. 5. We are_________ a school trip next Sunday.
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