第三节One possible versionParagraph 1Finally, afler struggling for a minute or tuo, I still gotpulled underwater. I told myself I should never give upThen I pulled the weed again with great efforts. The weedfinally broke. I swam back to the surface to take a debreath. I saw two young men in canoes, racing each other.I was exhausted and shouted for help. The two men saw meand raced towards me. By the time they reached me, I hadbeen already unconsciousParagraph 2When woke up, I was in an empty room lying on abed. It was not until a doctor came into the room that I realized that I was in a hospital. Jimmy and Bobby told me thetwo young men brought me to the shore and sent me to thehospital. After a few minutes, my parents with half angryand half worried faces walked in. My parents scolded me ifor running out of the house secretly but were also glad thatI was not seriously injured. I will never forget that terrifyingexperience. Neither will I ever want to show off again

21.(11分,除标注外,每空1分)(1)内质网coPI(2)细胞膜外细胞膜上加工运输(2分).(3)一定的流动性(4)受体信息传递5)胰岛素合成过程中,囊泡运输出现障碍或者不能准确释放到目的位置(2分)【解析】(1)分析题图可知,甲表示内质网,乙表示高尔基体,丙是囊泡。COPⅡ具膜小泡从内质网运向高尔基体,而COPI具膜小泡是从高尔基体运向内质网,因此,若定位在内质网中的某些蛋白质偶然掺人到高尔基体中,则图中的cOPI可以帮助实现这些蛋白质的回收。(2)由图可知,乙产生的囊泡可以将物质投送到细胞膜外、细胞膜上。物质投送到细胞不同的位置,体现了细胞器乙对集中在其中的蛋白质具有加工、运输的作用。(3)丙(囊泡)与细胞膜融合过程反映了生物膜在结构上具有一定的流动性。(4)该细胞分泌出的蛋白质被运输到靶细胞时,能与靶细胞膜上的特异性受体结合,引起靶细胞的生理活动发生变化,此过程体现了细胞膜具有信息传递(信息交流)的功能。(5)糖尿病的产生原因除了可能是胰岛素合成过程(环节)有问题或者胰岛素作用的靶细胞对胰岛素不敏感外,还有可能是胰岛素合成后囊泡运输出现障碍,胰岛素不能准确释放到目的位置。

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