标题: 求助一道GWD分类题~~~有没有学过医学生物得来帮我看看=口= [打印本页] 作者: ljyjulia 时间: 2010-12-22 09:33 标题: 求助一道GWD分类题~~~有没有学过医学生物得来帮我看看=口= In response to viral infection, the immune systems of mice typically produce antibodies that destroy the virus by binding to proteins on its surface.Mice infected with a herpesvirus generally develop keratitis, a degenerative disease affecting part of the eye.Since proteins on the surface of cells in this part of the eys closely resemble those on the herpesvirus, scientists hypothesize that these cases of keratitis are caused by antibodies to herpesvirus. which of the following, if true, gives the greatest additional support to the scientists' hypothesis? A. Other types of virus have surface protein that closely resemble proteins found in various organs of mice. B. There are mice that are unble to form antibodies in response to herpes infections, and these mice contract herpes at roughly the same rate as other mice. C.MIce that are infected with a herpesvirus but do not develop keratitis produce as many antibodies as infected mice that do develop keratitis. D. There are mice that are unable to form antibodies in response to herpes infections, and these mice survive these infections without ever developing keratitis. E. Mice that have never been infected with a herpesvirus can sometimes develop keratitis. 意思翻译上不大理解 求助好心人看看 我选D作者: sdcar2010 时间: 2010-12-22 09:51
D is the right answer.作者: ljyjulia 时间: 2010-12-22 10:07
题目是不是可以这样理解 老鼠的免疫系统通过在其表面附着蛋白质来产生杀死病菌的抗体。有一种病菌叫herpesvirus，还有一种病叫keratitis，得herpesvirus的常常会得keratitis，这种病发生在眼睛上。（这时为了说明herpes和keratitis的联系）说眼睛细胞表面的蛋白质很像herpes表面的蛋白质（暗指很可能keratitis表面也可产生herpes的抗体），科学家就假设出antibodies of herpes 和keratitis 因果关系。
可见这个因果关系是由两个现象发生时间以及产生抗体环境相似性得出得。 D选项： 是否A--->B？可以当去掉A时看B是否还会发生。作者: sdcar2010 时间: 2010-12-22 12:12
Hypothesis: these cases of keratitis are caused by antibodies to herpesvirus
Keratitis --> antibodies to herpesvirus (A --> B) No antibodies to herpsevirus --> No Keratitis (~B --> ~A)作者: sdcar2010 时间: 2010-12-22 12:14
When I use A --> B, I mean A is the sufficient condition and B is the necessary condition of one logic statement: if A, then B; When A happens, B also happens; All A has B.