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
外语
You do not usually get something for nothing. Now, a new study reveals that the evolution of an improved learning ability could
You do not usually get something for nothing. Now, a new study reveals that the evolution of an improved learning ability could
admin
2022-04-03
37
问题
You do not usually get something for nothing. Now, a new study reveals that the evolution of an improved learning ability could come at a particularly high price an earlier death.
Past experiments have demonstrated that it is relatively easy through selective breeding to make rats, honey bees and—that great favourite of researchers—fruit flies a lot better at learning. Animals that are better learners should be competitive and, thus, over time, come to dominate a population by natural selection. But improved learning ability does not get selected amongst these animals in the wild. No one really understands why.
Tadeusz Kawecki and his colleagues at the University of Fribourg in Switzerland have measured the effects of improved learning on the lives of fruit flies. The flies were given two different fruits as egg-laying sites. One of these was laced with a bitter additive that could be detected only on contact. The flies were then given the same fruit but without an additive. Flies that avoided the fruit which had been bitter were deemed to have learned from their experience. Their children were reared and the experiment was run again.
After repeating the experiment for 30 generations, the children of the learned flies were compared with normal flies. The researchers report in a forthcoming edition of Evolution that although learning ability could be bred into a population of fruit flies, it shortened their lives by 15%. When the researchers compared their learned flies to colonies selectively bred to live long lives, they found even greater differences. Whereas learned flies had reduced their life spans, the long-lived flies learned less well than even average flies.
The authors suggest that evolving an improved learning ability may require a greater investment in the nervous system which takes resources away from processes that delay ageing. However, Dr. Kawecki thinks the effect could also be a by-product of greater brain activity increasing the production of Reactive Oxygen Species (ROS), which can increase oxidation in the body and damage health.
No one knows whether the phenomenon holds true for other animals. So, biologists, at least, still have a lot to learn.
According to Dr. Kawecki, greater brain activity________.
选项
A、reduces oxygen consumption
B、regulates the nervous system
C、speeds up the ageing process
D、stabilizes the ageing process
答案
C
解析
推断题。从文章第五段最后一句“However, Dr. Kawecki thinks the effect could also be a by-product of greater brain activity increasing the production of Reactive Oxygen Species (ROS), which can increase oxidation in the body and damage health. ”可知,奎克教授认为这种影响也可能是大脑活动产生活性氧的副作用,活性氧会增强身体的氧化并损害健康。由此可推断,大量的脑力活动会加速衰老,故选C。
转载请注明原文地址:https://kaotiyun.com/show/fHNd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Whenisthewoman’shospitalappointment?
Whatwouldthewomanmostprobablydo?
GenerationsofAmericanshavebeenbrought【C1】______tobelievethatagoodbreakfastisimportantforhealth.Eatingbreakfast
GenerationsofAmericanshavebeenbrought【C1】______tobelievethatagoodbreakfastisimportantforhealth.Eatingbreakfast
Whenwethinkabouthappiness,weusuallythinkofsomethingextraordinary,apeakofgreatdelight--andthosepeaksseemtoget
Whena13-year-oldVirginiagirlstartedsneezing,herparentsthoughtitwasmerelyacold.Butwhenthesneezescontinuedfor
WhendopeopleusuallywearT-shirts?
Writealettertoyourfriend,tellinghimabout:(1)You’llhavethreedays’springvacationandyouareplanningatripto
Thequestionofwhetherwarisinevitableisonewhichhasconcernedmanyoftheworld’sgreatwriters.Beforeconsideringthis
Whatistheman’sfirsttiponaproductiveworkday?
随机试题
电触点水位计工作原理是利用水与汽的导电性不同而设计的。
PleasereadthefollowingarticleinChinesecarefully,andthenwriteasummaryof200wordsinEnglishontheANSWERSHEET.Ma
可见肾小球内免疫球蛋白及补体沉积的肾小球肾炎有
A.地黄B.甘草C.黄芪D.紫草E.当归表面灰黄色,以条粗长、断面色黄白、味甜、有粉性者为佳的药材是
A.麻子仁丸B.六磨汤C.润肠丸D.半硫丸E.保和丸热秘宜选用的方剂是
某企业根据“工资结算汇总表”结算本月应付工资总额560000元,代扣企业代垫的职工医药费60000元,实发工资500000元。要求做出向银行提取现金、发放工资、代扣款项的会计分录。
随着生产的发展,人们的分工越来越细,科学与文学逐渐分开,形成了“科学界”“文学界”。如今,分工更细了,研究科学的人,一辈子只限于某一学科、某一专业,以至某一专题,这样,“隔行如隔山”,常使人的视听囿于很小的天地,成为分工的奴隶。这段话直接支持了这样
人民法院在行政诉讼中,既需要对具体行政行为的合法性进行审查,也需要对其合理性进行审查。()
(2008年单选20)根据宪法学的基本理论,形成宪法规范的最基本方式是()。
NewYear’sDayisthelastbankholidayofthefestiveseason.Itmeansmostpeoplehavetogotoworkthenextday:【B1】______a
最新回复
(
0
)