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问题 问答题

密码子的摆动性(wobbling)

答案

参考答案：密码子第三位碱基与反密码子第一位碱基配对时，不一定完全遵循A-U、G-C的配对原则，可有一定的变动，称为密码子的摆动性(wobbling)。

改错题

短文改错

     A ten-year-old boy entered into a coffee shop and sat at table. A waitress puts a glass of water in

front of him. "How much is a chocolate ice cream?" "Fifty cents." The little boy pushed his hand

out of his pocket and counted the number of the coins. "How much are a dish of plain ice

cream?" he asked. The waitress was a bit patient. "Thirty-five cents," he said rudely. The little

boy counted the coins again. "I'll have the plain ice cream." The boy finished the ice cream and

paid for the cashier. When the waitress came back, she was surprising at what she saw. There

were fifteen cents besides the empty dish, her tip.

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单项选择题

结构化程序的基本控制结构有 ( )

A) 赋值、子程序调用和输入输出
B) 条件语句、循环语句和过程语句
C) 顺序、选择和循环
D) 复合、分支、重复和递归
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