首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
财务会计
It’s one of our common beliefs that mice
It’s one of our common beliefs that mice
昕玥
2019-12-17
31
问题
It’s one of our common beliefs that mice are afraid of cats. Scientists have long known that even if a mouse has never seen a cat before, it is still able to detect chemical signals released from it and run away in fear. This has always been thought to be something that is hard-wired into a mouse’ s brain.But now Wendy Ingram, a graduate student at the University of California, Berkeley, has challenged this common sense. She has found a way to “cure” mice of their inborn fear of cats by infecting them with a parasite, reported the science journal Nature.The parasite, called Toxoplasma gondii, might sound unfamiliar to you, but the shocking fact is that up to one-third of people around the world are infected by it. This parasite can cause different diseases among humans, especially pregnant women—it is linked to blindness and the death of unborn babies.However, the parasite’s effects on mice are unique. Ingram and her team measured how mice reacted to a cat's urine (尿) before and after it was infected by the parasite. They noted that normal mice stayed far away from the urine while mice that were infected with the parasite walked freely around the test area.But that's not all. The parasite was found to be more powerful than originally thought—even after researchers cured the mice of the infection. They no longer reacted with fear to a cat's smell, which could indicate that the infection has caused a permanent change in mice's brains.Why does a parasite change a mouse's brain instead of making it sick like it does to humans The answer lies in evolution.“It’s exciting scary to know how a parasite can manipulate a mouse's brain this way,"Ingram said. But she also finds it inspiring. "Typically if you have a bacterial infection, you go to a doctor and take antibiotics and the infection is cleared and you expect all the symptoms to also go away,” she said, but this study has proven that wrong. “This may have huge implications for infectious disease medicine."The experiment found that mice infected with toxoplasma gondii__________.查看材料
选项
A.stayed far away from cat’s urineB.moved around the area freely and tearlesslyC.because more sensitive to cat's smellD.were more afraid of cats
答案
B
解析
根据文章第四段“They noted that normal mice stayed far away from the urine while mice that were infected with the Darasite walked freelv amund the test area."可知,受到寄生虫感染的老鼠能够自由随意地在测试区域周围走动,故选B。
转载请注明原文地址:https://ti.zuoweng.com/ti/dYzlKKKQ
相关试题推荐
It’soneofourcommonbeliefsthatmice
It’soneofourcommonbeliefsthatmice
It’soneofourcommonbeliefsthatmice
It’soneofourcommonbeliefsthatmice
It’soneofourcommonbeliefsthatmice
随机试题
中药饮片在调配过程需要将其放在中央的是 A.川芎10g B.荷叶10g C
影响资本周转速度的因素有:
—个220kV变电所,经稳定计算220kV出线发生三相短路,必须快速切除故障,否
某工程计划中,A工作的持续时间为5天,总时差为7天,自由时差为3天,如果A工作实
甲发函至乙搅拌站,欲采购某标号早强水泥10吨,500元/吨,货到付款。乙要求款到
2006年1月9日在我国生效的是 A《中华人民共和国食品安全法》 B《烟
知识点:心血管疾病的预防 男,52岁,公司经理,吸烟10年每天2包,体重
在Word的编辑状态下,打开某一文档的作用是( )
以下关于新生儿的说法中正确的是()。 (A)新生儿指从出生到1个月的婴儿 (B)新生儿是婴儿独立发挥生理机能的开始 (C)新生儿阶段的婴儿开始建立...
根据《环境保护税法》,下列情形中,暂予免征环境保护税的有()。A、农业生产(不包括规模化养殖)排放应税污染物的B、机动车排放应税污染物的C、依法设立的城乡