两个氨基酸分子缩合形成二肽，脱去一分子水。这个水分子中的氢来自[]A．羧基（－COOH）B．氨基（－NH2）C．连在碳原子上的氢D．氨基和羧基-高一生物

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• I don’t think The Flowers of War by Zhang Yimou is popular among teenagers, _________?A．are theyB．is
• It’s the third time that Li Ming has been to Xi’an , _______? A．isn’t heB．hasn’t heC．isn’t itD．hasn’
• Look！The ground is wet.It must have rained last night，________？A．hasn’t itB．didn’t itC．mustn’t itD．h
• Fighting an artificial greenhouse effect seems to be the greatest of environmental challenges, _____
• Mrs Black doesn’t believe her son is able to design a digital camera, ______ ?A．doesn’t sheB．does sh
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• 某细菌能产生一种“毒性肽”，其分子式是C55H70O19N10，将它彻底水解后只能得到下列四种氨基酸：甘氨酸（C2H5NO2）丙氨酸（C3H7NO2）、苯丙氨酸（C9H11NO2）、谷氨酸（C5H9N
• He must have been annoyed by something yesterday, _____?A．wasn’t heB．hasn’t heC．needn’t heD．mustn’t
• There is no doubt that eating organic food will make you healthier, ________？A．will itB．does itC．is
• 蛋白质是生命活动的主要承担者。下图表示有关蛋白质分子的简要概念图，对图示分析不正确的是[]A．a肯定含有N元素B．①过程有水生成C．多肽中b的数目等于c的数目D．d表示氨基酸的多-高一生物
• 可被胰蛋白酶水解的三肽是[]A．Phe－Ala－ArgB．Asp－Met－AlaC．Met－Gln－ProD．Pro－Arg－MetE．Phe－Ala－Met-高一生物
• 某肽链由51个氨基酸组成，如果用肽酶把其分解成1个二肽、2个五肽、3个六肽、3个七肽，则这些短肽的氨基总数的最小值、肽键总数、分解成这些小分子肽所需水分子总数依次是[]A-高一生物
• The student must be working very hard, ________?A．doesn’t heB．mustn’t heC．needn’t heD．isn’t he-高三英语
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• —Where _______?—I got caught in the traffic, or I would have been here sooner.A．did you goB．had you
• 下列有关蛋白质、氨基酸的叙述，错误的是[]A．催产素和血管舒张素均为九肽，但它们的功能差异很大，不仅仅取决于构成两者的氨基酸种类B．鸡蛋煮熟后，蛋白质变性失活，但并未引-高一生物
• 两个氨基酸分子缩合成二肽生成水，这个水分子中的氢来自[]A．羧基B．氨基C．和碳原子连接的氢D．氨基和羧基中各一个氢-高一生物
• A: Alice, you clean the house, ? B: But I did it yesterday.A．do youB．will youC．didn’t youD．don’t you
• – You must have learnt the good news of our team winning the football match, _____ you? -- Yes. I __
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• Nothing that you say can change his mind, ________？A．do you B．don't youC．can it D．can't it
• 连接两个氨基酸的化学键叫做肽键，下列结构中表示肽键的是[]A．-NH2B．-COOHC．-CO-NH-D．-CH3-高一生物
• 现有氨基酸800个，其中氨基总数为810个，羧基总数为808个，则由这些氨基酸合成的含有2条肽链的蛋白质共有肽键、氨基和羧基的数目依次分别为[]A．798、2和2B．798、12和10C．799-高一
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• ---My Dad began to teach me English when I was eight.---Wow. You must have studied English for six
• ---Jack, you erase the blackboard today, __________?---But I did it yesterday.A．will youB．do you C．w
• (2013·甘肃河西五市一模)Look! The ground is wet. It must have rained last night, ________？A．hasn't it B．
• 如图所示某化合物的结构式，据图回答：(1)该化合物中有_____个氨基和_______个羧基。(2)该化合物有_______种氨基酸，造成这种不同的基团编号是________。(3)该化合物是由___
• 下列物质中一定含有肽键的一类物质是[]A．载体B．维生素C．酶D．激素-高二生物
• She said she couldn’t finish the work in time, _______?A．could sheB．couldn’t sheC．did sheD．didn’t sh
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• —Nothing wrong with it, ____?—Yes. The computer says, “Please check this disk before entering data.”
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• 现有1000个氨基酸，其中氨基有1020个，羧基有1050个，则由此合成的4条多肽链中共有肽键、氨基、羧基的数目是[]A．999、1016、1046B．996、1、1C．996、24、54D．996、
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• 现有氨基酸800个，其中氨基总数为810个，羧基总数为808个，则由这些氨基酸合成的含有2条肽链的蛋白质共有肽键、氨基和羧基的数目依次分别为[]A．798、2和2B．798、12和10C．799-高二