问题
单项选择题 A1/A2型题
质粒在细菌间的转移方式主要是（）
A.转化
B.接合
C.转导
D.溶原性转换
E.原生质体融合
答案
参考答案：B
解析：质粒在细菌间的转移方式主要是接合，通过性菌毛的作用从供体菌传递给受体菌。
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质粒在细菌间的转移方式主要是（）
A.转化
B.接合
C.转导
D.溶原性转换
E.原生质体融合
参考答案：B
解析：质粒在细菌间的转移方式主要是接合，通过性菌毛的作用从供体菌传递给受体菌。
| 阅读短文，根据短文内容，用方框中所给的词填空。 | |
once a week. Each time, we choose some books to 3_______ . Then the next time, we tell each other about the books in English. At first, I couldn't express myself very well. One or two weeks later, I 4_______ most people could understand me quite well. They all said I had 5_______ great progress. We watch English films together, too. We watch the same scene several times, and then we act it out. That gives 6_______ good speaking practice and it's great fun. Don't expect to achieve a high level quickly-after all, Rome wasn't built in a day. But 7_______ you keep practicing, your English will get better and better. |