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【单选题】
如果遗传密码是四联体密码而不是三联体,而且tRNA反密码子前两个核苷酸处于摆动的位置,那么蛋白质正常合成大概需要多少种tRNA?A.
约256种不同的tRNA
B.
150～250种不同的tRNA
C.
小于20种
D.
与三联体密码差不多的数目
E.
取决于氨酰-tRNA合成酶的种类
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【简答题】抄一抄，看谁抄的又快又好。 a __________________________ e __________________________ i __________________________ o __________________________ u __________________________
【判断题】Main points are very brief statements that indicate exactly where you are in the speech.
A.
正确
B.
错误
【简答题】When talking about going to college,
what are the author’s two main points?A. She has lost many things, but gained many things too. B. She has very good parents and also very good classmates. C. She h...
【简答题】Golgi complex高尔基体
【简答题】翻译信函: Date: May 18th, 2016 Dear Sirs, We are pleased to confirm the agreement about the agency reached between us after so many discussions. We wish this would be a very good beginning of the business...
【单选题】When talking about going to college, what are the author’s two main points?
A.
She has lost many things, but gained many things too.
B.
She has very good parents and also very good classmates.
C.
She has gained new friends and learned to be more responsible for her actions.
D.
She left home on a beautiful summer day and arrived at her college far away in the country
【简答题】The Golgi complexpackages some fifty hydrolytic enzymes in__________.
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