通过鸟氨酸循环合成尿素时，线粒体提供了氨，这个氨分子来源于（

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问题单项选择题

通过鸟氨酸循环合成尿素时，线粒体提供了氨，这个氨分子来源于（）。

A、Gln

B、Ala的氧化脱氨基作用

C、Arg

D、瓜氨酸

E、Glu的氧化脱氨基作用

答案

参考答案：E

改错题

短文改错

How to protect the environment becomes one of the big problems in the world.

1.________

We can find the rubbish not only pollutes our environment but also harm people's health.

2.________

So we should throw rubbish onto the ground.

3.________

Some factory are pouring waste water into rivers,lakes and fields.

4.________

It can pollute plants;sometimes it can kills lots of fish.

5.________

We must keep our environment clean and untidy.We have only one earth.

6.________

We must try our best protect her,and make our home more beautiful.

7.________

填空题

岗位责任制的内容是（）、（）、（）、及管辖范围。