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  3. A. Autibiotics destroy pathosenic microbes by preventing the formation of the walls surrounding the membranes of the microbial c

A. Autibiotics destroy pathosenic microbes by preventing the formation of the walls surrounding the membranes of the microbial c

admin2009-07-11  69
问题 A. Autibiotics destroy pathosenic microbes by preventing the formation of the walls surrounding the membranes of the microbial cells that prevent the cells from split- ting open.   
B. More than 70 clinically useful antibiotics have been in- vented to fight pathogenic microbes and cancer cells by interacting with their normal cell processes.   
C. Human cells are not surrounded by a membrane   
D. Some antibiotics disrupt the cell membrane of certain microbes, letting vital nutrients to escape form the cell or poisonous substances to enter and kill the cell.     
E. Nystatin is used to disrupt the wall surrounding the membrane.   
F. Some antibiotics fight disease by interfering with chemical activities in microbial cells but not in human cells.  
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答案E
解析 见第五段第一句“All cells produce proteins and nucleic acids， which are vital to the life of any organism．”所有细胞都会制造生物体内的两个性命忧关的物质：蛋白质和核酸。
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