下列有关别(变)构酶的叙述，错误的是A．别构酶常是由多个亚基组

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问题单项选择题

下列有关别(变)构酶的叙述，错误的是

A．别构酶常是由多个亚基组成

B．亚基与底物结合的亲和力因亚基构象不同而变化

C．别构酶的反应动力学曲线呈S状

D．变构效应剂与酶的结合属于共价结合

E．酶构象改变后，其活力可升高也可降低

答案

参考答案：D

句型转换

根据要求进行句子变换。

1. The girl has had the silk hat for three years.(改为一般过去时)

The girl _______ the silk hat three years _______.

2. Where shall I buy Christmas presents? Could you tell me? (改为复合句)

Could you tell me_______ Christmas presents?

3. We plant millions of trees in North China. (改为被动语态)

Millions of trees_______ in North China.

4. English is the most widely spoken language in the world. (改为同义句)

English is _______ spoken than any other language in the world.

5. I don't know where I should go. (改为同义简单句)

I don't know _______.

问答题简答题

煤矿常用的带式输送机主要有哪些？