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

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• 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
• I don’t think David could have done such a stupid thing last night, ?A．did heB．didn’t heC．do ID．don
• —I don’t suppose Jimmy could have done well in the mid-term exam last week,______?--- ______ he almo
• ---My Dad began to teach me English when I was eight.---Wow. You must have studied English for six
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• (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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• Something has to be done to stop the rivers from being further polluted, ?A．doesn’t itB．hasn’t itC．d
• -----Alice, you clean the blackboard today, _________?----- But I cleaned it yesterday.A．won’t youB．
• . Reading books is very important for developing the students’ understanding of the world, _______?A
• 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
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