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

更多内容推荐

• 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
• ---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
• Bob had little idea that his wife was in danger, _____?A．didn’t heB．did heC．wasn’t sheD．was she-高三英语
• I don’t believe that he will marry Kathy whom he doesn’t love at all,________? A．do I B．don’t IC．wil
• You must have missed the first train yesterday, ________ you?A．weren’t B．mustn’tC． didn’tD． haven’t-
• —Nothing wrong with it, ____?—Yes. The computer says, “Please check this disk before entering data.”
• She doesn’t suppose the prices will go down this week, _______?A．does sheB．doesn’t sheC．won’t theyD
• 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、
• It's the first time that he has been to Australia，________？A．isn't heB．hasn't heC．isn
• Plastic bottles can be recycled but they need cleaning thoroughly, _______ they?A．needn'tB． do
• We had hoped that you would be able to visit us, but you.A．didn’tB．hadn’tC．wouldn’tD．would not have-
• You must have read about Mark Twain long ago, ____?A．mustn't youB．haven't youC．didn't
• –I don’t suppose he could have done well in the exam last week, _____? --______, he almost failed th
• I don't think a warm winter always has a negative influence on our life, _____?A．do IB．does itC
• He must be helping the old man to water the flowers，________？A．is heB．isn't heC．must beD．mustn
• I told them not everybody could run as fast as you did，________？(2011·重庆)A．could heB．didn't IC．
• 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
• Scientists don’t think that a warm winter always has a negative influence on our life,____?A．don’t t
• I heard that some patients who had undergone laser eye surgery experienced sudden losses of vision,
• I do believe that all the Senior 3 students in our school will do well in the coming college entranc
• There is little doubt in your mind that he is innocent, ________/A．is heB．isnit thereC．is thereD．ins
• I am sure you’d rather he stayed in New Zealand, ______?A．wouldn’t youB．did youC．didn’t heD．am not I
• I don’t suppose he could have gone to the job interview yesterday, __________?A．has heB．could he C．d
• ---I don’t think your children could have been used to the quick pace of life while working in Shenz
• You must have been caught in the traffic jam yesterday, ______you?A．weren’tB．didn’tC．mustn’tD．haven’
• It is the second time that you have been late, ______?A．haven’t you B．isn’t itC．is itD．have you-高三英语
• _______her boyfriend is?A．What do you thinkB．Do you think whatC．What you thinkD．What you think-高一英语
• Black doesn’t believe his son is able to design a digital camera,_____?A．is heB．isn’t heC．doesn’t he
• Mrs. Black doesn’t believe that her son is able to design a digital camera, ______?A．is heB．isn’t he
• As far as we know, half of Canadian teenagers do not get enough sleep on school nights, _____?A．do t
• —Jack, you water the flower today, ___?— But, dad, I watered it yesterday.A．do youB．will youC．didn’t
• —I suppose he’ll pass the exam, _______________? —Of course he will.A．will heB．won’t heC．don’t ID．do
• We hardly believe the news is true,________A．do weB．don’t weC．is itD．isn’t it-高三英语
• You must have watched that football match last night, __________?A．must youB．haven’t youC．didn’t you
• I’m sure that the teacher’s told you about the your result of the examination. ______ ?A．am not IB．h
• Ｉdon’t think Linda could have done such a stupid thing last night，_________?A．do IB．didn’t sheC． did
• I don’t suppose Tom has told you the news, _______?A．do IB．don’t IC．does heD．has he-高一英语
• Paul’s wish is to become a pilot, ____?A．isn’t heB．isn’t itC．is heD．is it-高一英语
• He seldom has lunch at school, ________? A．hasn't he B．has he C．doesn't he D．does he-高二英语
• You must have read about Mark Twain long ago, ____?A．mustn’t youB．haven’t youC．didn’t youD．needn’t y
• We don’t suppose he has achieved his goal, _________?A．has heB．do weC．don’t weD．hasn’t he-高一英语