下列哪项不是构成蛋白质的氨基酸?(    ) A .           B

下列哪项不是构成蛋白质的氨基酸?(    )

A .           B .

C .     D .

 

答案

B

相关题目

有关水分子的叙述正确的是   A.水在固态时分子是静止不动
有关水分子的叙述正确的是   A.水在固态时分子是静止不动的       B.保持水的化学性质的微粒是水分子   C.水由液态变成气态时水分子质量变小  
在培养酵母菌的瓶内测得消耗葡萄糖的摩尔数与产生酒精的
在培养酵母菌的瓶内测得消耗葡萄糖的摩尔数与产生酒精的摩尔数之比是2:3,由此,可以估计出氧气的消耗量与二氧化碳的发生量之比为(    )  
如图,以1×3方格纸中的格点为起点和终点的所有向量中,有多
如图,以1×3方格纸中的格点为起点和终点的所有向量中,有多少种大小不同的模?有多少种不同的方向?
下列溶液中,与100mL 0.5mol/L NaCl溶液所含的Cl-物质的量浓度
下列溶液中,与100mL 0.5mol/L NaCl溶液所含的Cl-物质的量浓度相同的是(      )     A.100mL 0.5mol/L MgCl2溶液      B.200mL 0.25mol/L AlCl3溶液   C.25ml
3.    He is so e_____ for knowledge that he stays late every evening.  
3.    He is so e_____ for knowledge that he stays late every evening.  
As a graducate in computer science, he ___ to work out the problem. A. wouldn't
As a graducate in computer science, he ___ to work out the problem. A. wouldn't have failed  B. can't have failed  C. mustn’t have failed  D. might not have failed
一平板小车静止在光滑的水平地面上,甲、乙两人分别站在
一平板小车静止在光滑的水平地面上,甲、乙两人分别站在车上左、右端,当两人同时相向而行时,发现小车向左移动,则(    ) A.若两人质量相等,
The couple finally bought the house they wanted, for they _______enough money.
The couple finally bought the house they wanted, for they _______enough money.        A.had saved B.were saving      C.would save       D.were to save

最新题目