由4个氨基酸缩合而成的化合物被称为[]A．蛋白质B．三肽C．肽键D．四肽-高二生物

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• 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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• Look！The ground is wet.It must have rained last night，________？A．hasn’t itB．didn’t itC．mustn’t itD．h
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• 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
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• 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
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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
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• 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___
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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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