【单选题】【消耗次数：1】
目前公认的酶与底物结合的学说是
①
活性中心说
②
诱导契合学说
③
锁匙学说
④
中间产物学说
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相关题目
【多选题】
下列那项不符合“诱导契合”学说().
①
A.底物类似物不能诱导酶分子构象的改变
②
B.酶与底物的关系如锁钥关系
③
C.底物的结构朝着适应活性中心方向改变而酶的构象不发生改变
④
D.酶活性中心有可变性，在底物的影响下其空间构象发生一定的改变，才能与底物进行反应
【单选题】
酶的活性中心是指
①
整个酶分子的中心部位
②
酶蛋白与辅酶结合的部位
③
酶发挥催化作用的部位
④
酶分子表面具有解离基团的部位
⑤
酶的必需基团在空间结构上集中形成的一个区域，能与特定的底物结合并使之转化成产物
随机题目
【单选题】
30. -May I borrow these three magazines? -____. You may keep them for two weeks.
①
Of course not
②
By all means
③
I’m afraid not
④
It’s up to you
【单选题】
—I made the cake by____ . Help yourself, Tom.—Thanks, Jane.
①
ourselves
②
himself
③
myself
④
herself
【单选题】
27. If it ____ tomorrow, we will not go out.
①
rains
②
will rain
③
is going to rain
④
is to rain
【单选题】
I dont know the park, but its____ to be quite beautiful.
①
said
②
told
③
spoken
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talked
【单选题】
He called the police for help, ____ that the problem was more than he could deal with.
①
to realize
②
having been realized
③
realizing
④
realized
【单选题】
By nine o’clock I ____ that my guests were not coming.?
①
recognized ?
②
realized ?
③
understood ?
④
noticed?
【单选题】
The flower is dead. I ____ it more water. ?
①
must give ?
②
should have given ?
③
?would have given ?
④
will give ?
【单选题】
____ what the situation would be like, they decided to keep silent.
①
Knowing not
②
Not know
③
Not knowing
④
Having not known
【单选题】
All of us think it difficult to ____ the difference between the two things.
①
talk
②
speak
③
lecture
④
tell
【单选题】
Alicereceived an invitation from her boss, ____came as a surprise.?
①
it ?
②
that ?
③
which ?
④
he?