问题
填空题 案例分析题
干扰素是治疗癌症的重要药物，它必须从血中提取，每升人血只能提取0.5μg，价格昂贵。现在美国加利福尼亚州的基因公司用如下图的方式生产干扰素。
细菌质粒能与干扰素基因能够拼接其原因是（）。人的干扰素基因在酵母菌体内合成了人的干扰素，说明了（）。
答案
参考答案：它们具有共同的物质基础和结构基础，以及具有相同的黏性末端；不同生物共用一套密码子。
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干扰素是治疗癌症的重要药物，它必须从血中提取，每升人血只能提取0.5μg，价格昂贵。现在美国加利福尼亚州的基因公司用如下图的方式生产干扰素。
细菌质粒能与干扰素基因能够拼接其原因是（）。人的干扰素基因在酵母菌体内合成了人的干扰素，说明了（）。
参考答案：它们具有共同的物质基础和结构基础，以及具有相同的黏性末端；不同生物共用一套密码子。
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| A train stopped at a small station.An old man on the train looked__1 _the window and saw a woman. The woman was selling cakes,and many people from __2__ train were buying them.The old man wanted __3_ a cake,but the old woman was standing far from him.It was raining hard and he _4__ want to go out of the train.? Suddenly he saw a boy.The boy was walking on the platform__5__ from him."Come here boy,"the old man shouted."Do you know __6__each of the cakes is?""Five cents,"the boy answered.The old man gave ten cents and asked him __7__two cakes."One is for me,and __8__is for you,"he told the boy.? Some minutes __9__,the boy came back.He was eating a cake.He gave the old man five cents and said,"Sorry,there was only _10__."?
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