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【单选题】
终止酶反应的方法有很多。其中错误的是()A.
反应时间一到,立即取出适量反应液,置于沸水浴中,加热使酶失活
B.
反应时间一到。立即取出适量反应液,置于室温中等待其冷却,测定。
C.
加入适宜的酶变性剂
D.
加入酸或碱溶液,使反应液的PH迅速远离催化反应的最适PH,从而使反应终止
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【简答题】糖类按单糖的聚合度可分为几类?每一类包括哪些主要糖?是否所有糖类都有甜味?哪种糖是天然糖中最甜的一种?简要说明糖在人体内的作用和功能。
【简答题】A coin is biased so that a head is twice
as likely to occur as a tail . If a coin is tossed
3 times, what is the probability of getting 2 head s and 1 tail ?
【单选题】What is the cause in the following paragraph: The arrangement of the workplace is important primarily because it significantly influence social interaction. Employee’s work locations, therefore, are l...
A.
social interaction
B.
employee ’ s work locations
C.
the information to which they are exposed
D.
their inclusion and exclusion from various activities and events withing the organization.
【简答题】葡萄糖（C 6 H 12 O 6 ）是人体中提供能量的最基本糖类物质，它在酶的作用下，反应放出的能量用于满足人体的机体活动和维持体温恒定．请根据其组成填空： （1）葡萄糖由______种元素组成，属于______（填“有机物”或“无机物”）． （2）1个葡萄糖分子中含有______个原子．
【单选题】葡萄糖是人生理活动中的重要物质,它在人体组织工作中的作用是( )
A.
相互连接合成蛋白质
B.
相互连接合成淀粉
C.
与水反应，同时放出热量
D.
被氧化，同时放出热量
【单选题】What is Alexander ’ s view on tariffs collected by the US government? Alexander said there’s evidence that tariffs collected by the U.S. government are being paid by American firms and consumers, rath...
A.
It will have no effect on the U.S. economy.
B.
It will have negative effect on the U.S. economy.
C.
It will have positive effect on the U.S. economy.
【单选题】The passage tells us that there is ______.
A.
a central library in each area
B.
a library in the center of each area
C.
one central library for all areas
D.
more than one central library in each area
【单选题】The easy way to use the library service is to______.
A.
inform. the library of your name and address
B.
tell the library the sorts of books you like
C.
buy the catalogues of the library
D.
ask the library to buy the books
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