问题
单项选择题 A1型题
参与合成蛋白质的氨基酸是（）
A.除甘氨酸外旋光性均为左旋
B.除甘氨酸外均为L-α氨基酸
C.只含α氨基和α羧基
D.均有极性侧链
E.均能与双缩脲试剂起反应
答案
参考答案：B
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参与合成蛋白质的氨基酸是（）
A.除甘氨酸外旋光性均为左旋
B.除甘氨酸外均为L-α氨基酸
C.只含α氨基和α羧基
D.均有极性侧链
E.均能与双缩脲试剂起反应
参考答案：B
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| Mike Hayes proved he was smart in his first year at college. In 2007, 1 he was a student at the University of Illinois, he came up with an idea to 2 his tuition fee (学费) and college costs problem. Hayes 3 everyone could afford to give him a penny. He wrote to Chicago Tribune writer Bob Greene. Hayes wanted each of the newspaper's 4 to send him a penny. Greene thought the idea sounded 5 and agreed to do it. "Just one penny," Hayes said. "A penny doesn't 6 anything to anyone. If everyone 7 is reading your paper looks around the room right now, there will be a 8 under a seat, or on the corner of the desk, or on the floor. That's all I'm 9 . A penny from each of your readers." In less than a month, the Many Pennies for Mike Fund (基金) had around 2.3 million pennies. Not everyone sent 10 a penny, many even sent dollars. Money was 11 from every state in the United States. So, Hayes 12 his $28,000 target (目标) and went on to get 13 for his degree in food science from the University of Illinois. Perhaps the last 14 is best left to his father, Bill Hayes: "When Mike first told me about his 15 , I just laughed and said that I thought it was foolish-which shows you that he's smarter than I am." | ||||
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