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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  52
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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选项
答案B
解析 见第一段最后一句“The number of deaths that are caused by pneumonia and scarlet fever has declined drastically since people began using antibiotics．”从人们开始使用抗生素以来，由肺炎和猩红热导致的死亡人数就有了大幅下降。
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