下列关于TATA盒的叙述,正确的是A.是与RNA-pol稳定结合的序列 B.是蛋白质

题型:单项选择题

问题:

下列关于TATA盒的叙述,正确的是

A.是与RNA-pol稳定结合的序列

B.是蛋白质翻译的起始点

C.是DNA复制的起始点

D.是与核糖体稳定结合的序列

E.是远离转录起始点,增强转录活性的序列

考点:广西临床住院医师规范化培训生物化学生物化学题库
题型:单项选择题

阅读理解。

     Tom and David were in the same class. They lived a little far from their school. David had a bike, but Tom

didn't. He had to get up early in the morning. After breakfast he went to the bus stop quickly to wait for the bus.Tom asked his father to buy him a bike, his father said "Well, I can buy a bike for you next term."

      Tom was happy, but he must learn to ride. He helped his mother with the washing and cleaning on Saturday. After lunch,he went to David's home. Mrs. White opened the door, "Can David come out and play with me?"

asked the boy, "Sorry, but he is sleeping now." answered his mother, "Then can his bike come out to play.

"Tom asked hopefully.

1. David and Tom _______.

A. classmates.

B. pen friends

C. teachers

D. in different classes

2. The school is _____ home

A. far away from Tom's

B. is near Tom's

C. across from David's

D. next to David's

3. David went to school____.

A. on foot

B. By bus

C. By car

D. by bike

4. Tom helped his mother ____on Saturday.

A. do homework

B. do some housework

C. read books

D. buy food in the market

5. Tom wanted to borrow(借) David's_____

A. books

B. bike

C. pens

D. English dictionary

题型:单项选择题

商法具有国内法兼国际法的色彩,这体现了商法的()

A.较强的兼容性特征

B.技术性特征

C.营利性特征

D.安全性特征

题型:单项选择题

Internet中不同网络和不同计算机相互通信的基础是( )。

A.ATM

B.TCP/IP

C.Novell

D.25

题型:单项选择题

一只突变型的雌果蝇与一只野生型的雄果蝇交配后,产生的F1中野生型与突变型之比为2:1,且雌雄个体之比也为2:1。这个结果从遗传学角度作出的合理解释是()

A.该突变基因为常染色体显性基因

B.该突变基因为X染色体隐性基因

C.该突变基因使得雌配子致死

D.该突变基因使得雄性个体致死

题型:单项选择题

列出至少三种移动通信网组成元素及功能。

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