各种tRNA分子3'末端的最后3个核苷酸均是A．CGA—OH B．AAC—OH C．

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问题单项选择题

各种tRNA分子3'末端的最后3个核苷酸均是

A．CGA—OH

B．AAC—OH

C．CAG—OH

D．UUA—OH

E．CCA—OH

答案

参考答案：E

补全对话，情景问答

( ) 1. Good morning, Miss Li!	A. Good. B. Good bye! C. Good morning.
( ) 2. Hi! My name is Li Tao. What's your name?	A. My name is Tom. B. What's your name? C. I don't know.
( ) 3. Hello, Amy! __________ Hello, John! Nice to meet you.	A. This is John. B. Where is John? C. John.
( ) 4. Hi! Let's go to school!	A. Bye! B. Hi! C. OK!
( ) 5. Hello, Zhao Ling! Nice to meet you.	A. Go to school. B. Nice to meet you, too. C. Bye!

单项选择题

被世人誉为“色绿、香郁、味甘、形美”四绝的茶叶品种是( )。

A．西湖龙井

B．碧螺春

C．黄山毛峰

D．观音韵