首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
公务员
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 ca
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 ca
admin
2017-12-05
63
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______.
选项
A、stayed far away from cat’s urine
B、moved around the area freely and fearlessly
C、because more sensitive to cat’s smell
D、were more afraid of cats
答案
B
解析
细节题。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 parasite walked freely around 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://kaotiyun.com/show/utnq777K
本试题收录于:
中学英语题库教师公开招聘分类
0
中学英语
教师公开招聘
相关试题推荐
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemsthatfouroutoffiveyoungpeoplenowgetonwithth
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemsthatfouroutoffiveyoungpeoplenowgetonwithth
Fromchildhoodtooldage,wealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.When
Fromchildhoodtooldage,wealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.When
Fromchildhoodtooldage,wealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.When
Toerrishuman.Toblametheotherguyisevenmorehuman.Commonsenseisnotallthatcommon.Whytellthetruthwhen
Toerrishuman.Toblametheotherguyisevenmorehuman.Commonsenseisnotallthatcommon.Whytellthetruthwhen
GrowingnumbersofscientiststhereforeseeAntarcticaasadistantearlywarningsensor,wherepotentiallydangerousglobaltre
ByfarthemostcommonsnakeinBritainistheadder(奎蛇).InScotland,infact,therearenoothersnakesatall.Theadderisa
随机试题
在采用首次适用策略的可变分区存储管理中,某作业完成后要收回其主存空间并修改空闲区表。使空闲区始址不改变,空闲区数也不变的情况是_______。
下列关于个人独资企业法律特征的表述中,正确的是( )。
商业银行贷款,应当实行审贷分离、分级审批的制度。()
民警甲接到王某报警称有人飞车抢夺,于是设卡拦截,因犯罪嫌疑人驾驶摩托车冲卡而逃,甲驾驶警车闯红灯追赶。犯罪嫌疑人逃至一小巷,警车无法驶入,民警甲便使用公民乙的摩托车继续进行追赶,抓获犯罪嫌疑人丙,但不慎将摩托车撞坏。对于犯罪嫌疑人丙委托辩护律师的行为,
OA(OfficeAutomation)
微分方程y’’-y’-6y=(x+1)e-2x的特解形式为().
设f(x)连续,则xf(x-t)dt=_______
Project(69)Management includes the processes required to ensure that the project includes all the work required, and only the wo
设A、B、C是三角形的3条边,则以下表示“任意两边之和大于第三边”的布尔表达式是
Nearlyallsurgicalstuntsstickthemselveswithneedlesand【C1】______instrumentswhileintraining.But【C2】______failtorepo
最新回复
(
0
)