蛋白质合成的方向是A.由mRNA的3'端向5'端进行 B.可同时由mRNA的3'端与

题型:单项选择题

问题:

蛋白质合成的方向是

A.由mRNA的3'端向5'端进行

B.可同时由mRNA的3'端与5'端方向进行

C.由肽链的N端向C端进行

D.由肽链的C端向N端进行

E.可同时由肽链的N端与C端方向进行

考点:临床执业医师生物化学遗传信息的传递
题型:单项选择题

阅读理解。

     A king gave his daughter a beautiful necklace. However , the necklace was stolen. So the kingtold

his people to look for it and said that he would give $ 50,000 to anyone who found it.

     One day, a man was walking along a dirty river. Suddenly , he saw the shining necklace in the river.

He decided to pick it up so that he could get the $ 50,000.

     He put his hand into the dirty river, but anyhow he couldn't get the necklace. He looked again and

the necklace was still there. He tried again. This time he walked into the river and put his whole arm in

to pick it up. But he still missed the necklace. Then again,he saw that the necklace was still right there.

So he became very angry.

     Just then, a boy saw him and asked him what was the matter. The man didn't tell the boy, thinking

that the boy might take the necklace for himself.

The boy could see that this man was in trouble. So he asked the man again and said that the would not

tell anyone about it. Thinking for a few minutes, the man decided to trust the boy. After telling the boy

what he was doing, the boy said, "Maybe you should try looking up into the tree."The man looked up

and saw that the necklace was shining in the tree.

1. What happened to the necklace?

A. It was broken.

B. It was stolen.

C. It was dirty.    

D. It was lent to the boy.

2. How did the man feel when he saw the necklace was still in the river after trying two times to get it?

A. He felt proud.

B. He felt happy.

C. He felt frightened.

D. He felt angry.

3. Why didn't the man tell the boy his trouble at first?

A. Because he didn't know the boy.

B. Because he haven't seen the boy before.

C. Because he thought the boy might take the necklace for himself.

D. Because the boy was the owner of the necklace.

4. Where did the man find the necklace at last?

A. In the dirty river.

B. In the tree.

C. In the boy's hand.

D. In the boy's house.

5. The writer wants to tell us that ______.

A. the necklace is very expensive

B. we shouldn 't put the necklace into the river

C. trusting others sometimes brings us good luck

D. we should never trust others because they can bring us bad luck

题型:单项选择题

下图是实验室常用的气体制取和收集装置,请你回答下列问题:

(1)写出下列编号的仪器名称:①            ,②                ;

(2)实验室制取和收集CO2,应选用的装置是(填编号)  ,反应的化学方程式为     ;

(3)小明选择B、D装置,用过氧化氢和二氧化锰制取一瓶O2,为了节约药品,他提出如下操作方法:先向B装置中加入少量二氧化锰,然后从仪器①中逐滴加入过氧化氢溶液,至刚好收满一瓶O2。他的操作方法(填“合理”或“不合理”)    ,理由是        。

题型:单项选择题

()是保证保险的保险标的。

A.保证

B.信用

C.名誉

D.责任

题型:单项选择题

linux中文件权限类型有()。

A.读

B.写

C.执行

D.完全控制

题型:单项选择题

专项安全施工方案编审批规定描述正确的是()。

A.应由施工项目部安全员组织编制

B.应由施工项目部项目经理组织编制

C.应由施工项目部技术负责人组织编制

D.施工项目部技术负责人批准

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