问题
填空题 案例分析题
酵母菌的维生素、蛋白质含量高，可用来生产食品和药品等。科学家将大麦细胞的LTP1基因植入啤酒酵母菌中，获得的啤酒酵母菌种可产生LTP1蛋白，并酿出泡沫丰富的啤酒。基本的操作过程如下：
有C进入的酵母菌分别在含有青霉素、四环素的两种选择培养基上的生长情况是（）。
答案
参考答案：在含有青霉素的培养基上能存活，但在含有四环素的培养基上不能存活
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酵母菌的维生素、蛋白质含量高，可用来生产食品和药品等。科学家将大麦细胞的LTP1基因植入啤酒酵母菌中，获得的啤酒酵母菌种可产生LTP1蛋白，并酿出泡沫丰富的啤酒。基本的操作过程如下：
有C进入的酵母菌分别在含有青霉素、四环素的两种选择培养基上的生长情况是（）。
参考答案：在含有青霉素的培养基上能存活，但在含有四环素的培养基上不能存活
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| Fred is a young 1 . He always works very hard. Today is 2 , and all the young soldiers are 3 , so their officer says to them, "You can go to town this 4 , but first I am going to inspect (检查)." Fred comes to the officer, and the officer says to him, "Your hair is very 5 . Go to the barber (理发师) and then come back to me again." Fred runs to the barber's shop. But it is 6 because it is Saturday. Fred is very 7 for a few minutes. But then he has a good 8 . He goes back to the officer. "Are my boots clean now, sir?" he asked. The officer does not look at Fred's 9 . He looks at his boots and said, "Yes, they are 10 better now. You can go out. And next week, first clean your boots, and come to me." |
| ( ) 1. A. officer ( ) 2. A. Monday ( ) 3. A. nice ( ) 4. A. year ( ) 5. A. long ( ) 6. A. opened ( ) 7. A. hungry ( ) 8. A. idea ( ) 9. A. face ( ) 10. A. very | B. student B. Friday B. free B. month B. short B. open B. tired B. friend B. hair B. many | C. worker C. Saturday C. busy C. week C. clean C. closed C. right C. car C. boots C. much | D. soldier D. Sunday D. worried D. afternoon D. black D. close D. sad D. officer D. clothes D. a few |