文卡特拉曼•拉马克里希南等三位科学家因“对核糖体结构和功能的_爱下问搜题

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问题选择题

文卡特拉曼•拉马克里希南等三位科学家因“对核糖体结构和功能的研究”而共同获得2009年诺贝尔化学奖．核糖体是进行蛋白质合成的重要细胞器，蛋白质是一类非常复杂的化合物，由碳、氢、氧、氮、硫等元素组成，蛋白质在酸、碱或酶的作用下能发生水解反应生成氨基酸，氨基酸分子中含有氨基（-NH₂，具有碱的性质）和羧基（-COOH，具有酸的性质）．氨基酸分子具有的性质是（　　）

A．只能与硫酸反应，不能与氢氧化钠反应

B．只能与氢氧化钠反应，不能与硫酸反应

C．既能与硫酸反应，又能与氢氧化钠反应

D．既不能与硫酸反应，又不能与氢氧化钠反应

答案

氨基酸分子中含有氨基（-NH₂，具有碱的性质）和羧基（-COOH，具有酸的性质），说明氨基酸分子既具有酸性又具有碱的性质，氨基酸既能和酸反应也能和碱反应，故答案选C．

完形填空

Thanksgiving Day was near. The Grade 7 teacher asked her students to   16 a picture of something for which they were thankful.
People celebrated the   17  with turkey and other traditional goods of the season. So,   18  of her students’ pictures were about them.
However, Jack made a ___19____ kind of picture. Jack was not the same as other boys. He always looked sad. When asked to draw a picture of something for which he was   20 , he drew a hand. Other students were all very    21  in the picture. Whose hand could it be? One child guessed it was the hand of a farmer, because farmers feed    22  . Another suggested a police officer, because the police   23  and care for people. Still    24  guessed it was the hand of God, for God feeds us. And so the    25  went on until the teacher almost forgot the young artist himself.
When the children had gone on to other subjects, she stopped at Jack’s desk and asked him   26    it was. The little boy looked up and said in a   27  voice, “It’s yours, teacher.”
She remembered the times she had taken his hand and   28    with him here or there, as she had with the other students. She often said, “   29  my hand, Jack. We’ll go outside.” Or, “Let me show you how to use your pencil.” Jack was most thankful for his ___30____ hand.

B．classmate’s

C．teacher’s

多项选择题

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