题干

下图甲表示麦芽糖酶催化麦芽糖水解的模型,图乙表示在最适温度下,麦芽糖酶的催化速率与麦芽糖量的关系。下列相关叙述错误的是(  )

A:该模型能解释酶的催化具有专一性,其中c代表麦芽糖酶

B:限制g~h上升的原因是酶的数量,故整个实验中应设置“麦芽糖酶的量一定”

C:如果温度升高或降低5℃,g点都将下移

D:可用斐林试剂鉴定麦芽糖酶是否完成对麦芽糖的催化分解

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答案(点此获取答案解析)

D

同类题1

(A)信息归纳:阅读下面的短文,根据短文内容完成信息卡。

    According to a new survey, student safety has become a big problem.Now in many big cities of China, many schools start a new lesson: self­protection. Students like this lesson because there are no exams or boring classes. And they can learn how to save lives and know how to stop danger before it really happens.

    Lin Li, a teacher from Yantai, gives young students advice on how to deal with danger.

    If you are in a traffic accident

    If a car hurts you, you should remember the car number.If it is a bicycle, try to call your parents before you let the rider go.This is because you don't know how seriously you are hurt.

    If it is raining hard and there is lightning

    Don't stay in high places and stay away from trees.

    When there is a fire

    Get away as fast as you can.Put wet things on your body and try to find an exit.Do not take the lift.

    If someone is drowning

    If you can't swim, don't get into the water.Cry out for help.

Remember that danger is never as far away as you think.Take care of yourself at all times!

    If you are robbed (抢劫)

    Keep calm.If you cannot cry for help or run away, give the robber your money.Try to remember what the robber looks like and tell the police later.

Information Card

Best title:____

Danger

What to do

____

If hit by a car, you're supposed to ____.

If hit by a bike, call your parents.

Raining with

lightning

Stay at low places and keep away from trees.

Fire

Don't take the lift and find an ____ as fast as you can.

Drowning

If you can't swim, just shout “Help!”

Robbery

Keep clam.

Remember the robber's ____ and tell the police later.