问题
单项选择题
基因表达中的诱导现象是指
A．阻遏物的生成
B．细菌利用葡萄糖作碳源
C．细菌不用乳糖作碳源
D．由底物的存在引起代谢底物的酶的合成
E．低等生物可以无限制地利用营养物
答案
参考答案：D
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基因表达中的诱导现象是指
A．阻遏物的生成
B．细菌利用葡萄糖作碳源
C．细菌不用乳糖作碳源
D．由底物的存在引起代谢底物的酶的合成
E．低等生物可以无限制地利用营养物
参考答案：D
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| Mr. Jackson works in a college. He likes reading and often 1 some books from the library. He keeps 2 to the radio every morning and reading 3 after dinner. So he knows much and teaches well. His 4 worship (崇拜) him very much. Mike, Mr. Jackson's little son, is only nine. He 5 likes reading books. And he often asks his father some questions. Mr. Jackson always thinks he is too 6 to understand him, so he chooses 7 ones to answer. Of course the boy is not satisfied with (对......满意) it. One day Mike read 8 about the electric lights and was 9 it when his father 10 him to do homework, he went on thinking 11 it. He asked him 12 questions, and his father answered all.Then his father said proudly, "Fathers always know 13 than sons!" The boy thought for a while and said, " 14 ." "Oh? Why?" Mike didn't answer and asked instead "Who invented the electric lights?" "Thomas Edison," answered Mr. Jackson. "Why didn't his father invent them then?" Mike asked again. Looking at his son, Mr. Jackson didn't know 15 to answer! | ||||
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