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选词填空:The things people make, and the way they make them, determine how cities grow and decline,and influence how empires rise and fall. So, any disruption to the world' s factories (1). Today, factories are being (2), filled with new sensors and new computers to make them quicker, more (3) , and more efficient.Robots and 3D printers have long (4) a world where you can make anything, any-where, from a computerized design. That vision is (5) closer to reality. These forces will lead to cleaner factories, producing better goods at lower prices, personalized to our individual needs and desires. Humans will be (6) many of the dirty, repetitive, and dangerous jobs that have long been a (7) of factory life.Greater efficiency (8) means fewer people can do the same work. Yet factory bosses in many developed countries are worried about a lack of skilled human workers -and see (9) and robots as a solution. But this period of rapid change in manufacturing is a (10) opportunity to make the world a better place.A) spared B) elite C) assumed D) digitised E) perilsF) inevitably G) matters H) feature I) bothering J) aggressivelyK) flexible L) advancing M) promised N) fantastic O) automation

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下列哪一种说法对蛋白质结构的描述是错误的?

A. 都有一级结构
B. 都有二级结构
C. 都有四级结构
D. 二级及三级以上的结构统称空间结构

具有四级结构的蛋白质的特征是

A. 含有两条或两条以上的多肽链
B. 每条多肽链都具有独立的生物学活性
C. 依赖肽键维系蛋白质分子的稳定
D. 以上都不对

下列有关蛋白质的叙述哪项是正确的?

A. 通常蛋白质的溶解度在等电点时最大。
B. 蛋白质分子的净电荷为零时的pH是它的等电点。
C. 大多数蛋白在饱和硫酸铵中溶解度最大。
D. 由于蛋白质在等电点世溶解度大,所以一般沉淀蛋白时应远离等电点。

肽键不能被水解断裂。

A. 对
B. 错

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