题目

在一定时间内让某种动物细胞吸收放射性同位素标记的氨基酸,经检查发现放射性同位素先后出现在右图中的1、2、3、4、5、6、7部位。请根据图回答下面的问题: (1) 图中具有双层膜的细胞器是。 (2) 7为,若该细胞为人体起着分泌抗体作用的免疫细胞,则细胞内形成抗体过程中发生脱水缩合的场所是(填序号),合成后先后通过和结构进行加工、包装。 (3) 6的主要成分是。 (4) 若合成的蛋白质为消化酶,推测该酶将由(听下面5段对话。每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅一遍。 1.What does the man mean? A. Nobody can be the best. B. Do as well as you can. C. It’s difficult to do something important. 2.Where did the conversation take place? A. In a theatre. B. In a taxi. C. In a restaurant. 3.Which sport is the woman best at? A. Swimming.        B. Tennis.     C. Volleyball. 4.What do we learn about Lisa? A. She needs 100 records. B. She likes jazz music. C. She prefers classical music to jazz. 5.What’s the man interested in during his free time? A. Playing chess. B. Collecting stamps. C. Nothing but play.  
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