题目内容
假定阅读框开始于下列每个核苷酸序列的头三个碱基，预计以它们为mRNA模板在蛋白质合成中所形成肽链的氨基酸
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【B12】
听力原文：M: Cindy! Have you heard the news？
W: No, Steve. What do you mean？
M: You know all the classes we've missed because of the snow？
W: Uh oh...
M: Yup—we're going to have to make them up and the dean says it will have to be during spring break.
W: Steve! We have our vacation all set! What are we going to do？ Do the others know？
M: I don't know but I certainly can't afford to miss five days of classes this semester, with that week I was sick...
W: But I really don't want to cancel our trip. All of us have already made our plane reservations!
M: I can try to call the travel agency; maybe they can refund our money. But before we do anything we need to speak with our professors.
W: You think they'll excuse us from class？
M: Probably not. But I was talking to Kevin this morning and he said that one of his professors told him that they could make up the class at a different time.
W: Wow—that's great! Which professor was it？
M: I don't know. But we're going to have to speak to all of them any way.
W: Why didn't they add extra days at the end of the semester before summer classes？
M: Because of the graduation date, which can't be changed.
W: Are other colleges around here doing the same thing？
M: I would imagine so—it's been such a bad winter and we've missed too many classes. We do really need to make them up.
W: I know, I know. I was just really looking forward to this vacation. The idea of the sun and the beach!
M: Oh look, there's Professor Hampton right now!
W: Come on, let's go talk to her!
(23)
预测当赖氨酸密码子第一个碱基由A变为G时对蛋白质结构与功能的影响。
【B15】
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