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
A、It was possible to reverse ageing in humans. B、It was possible to reverse ageing in mice. C、It was possible to make mice live
A、It was possible to reverse ageing in humans. B、It was possible to reverse ageing in mice. C、It was possible to make mice live
admin
2021-09-29
18
问题
An end to grey hair and crows-feet could be just 10 years away after scientists showed it is possible to reverse ageing in animals.
Using a new technique which takes adult cells back to their embryonic form, US researchers at the Salk Institute in California, showed it was possible to reverse ageing in mice, allowing the animals to not only look younger, but live for 30% longer.
The technique involves stimulating four genes which are particularly active during development in the womb. It was also found to work to turn the clock back on human skin cells in the lab, making them look and behave younger.
Scientists hope to eventually create a drug which can mimic the effect of the found genes which could be taken to slow down, and even reverse the ageing process. They say it will take around 10 years to get to human trials.
"Obviously, mice are not humans and we know it will be much more complex to rejuvenate a person. But this study shows that ageing is a very dynamic and plastic process," said Dr. Juan Carlos Izpisua Belmonte, a professor in Salk’s Gene Expression Laboratory.
Scientists have known for some time that the four genes, which are known collectively as the Yamanaka factors, could turn adult cells back to their stem cell state, where they can grow into any part of the body. But it was always feared that allowing that to happen could damage organs made from the cells, and even trigger cancer.
However, it was discovered that stimulating the genes intermittently reversed ageing, without causing any damaging side effects.
In mice with a premature ageing disease, the treatment countered signs of ageing and increased their lifespan by 30%. If it worked similarly in humans it could allow people to live until more than 100 years old. In healthy mice it also helped damaged organs to heal faster.
Questions 23 to 25 are based on the recording you have just heard.
23.What did the research carried out by US researchers at the Salk Institute in California show?
24.What can we know about the new technique?
25.What is the potential risk of turning adult cells back to their stem cell state?
选项
A、It was possible to reverse ageing in humans.
B、It was possible to reverse ageing in mice.
C、It was possible to make mice live 3 years longer.
D、It was possible to make humans live 30 years longer.
答案
B
解析
讲座中提到,加利福尼亚索克研究院的研究员们通过采用一种把成年细胞转回其胚胎状态的新技术表明,在老鼠身上逆转老化进程是有可能的,这一逆转不仅可以使动物们看起来更年轻,而且还可以延长它们30%的寿命。因此答案为B)。
转载请注明原文地址:https://kaotiyun.com/show/qIx7777K
0
大学英语六级
相关试题推荐
中国是全球水资源最为匮乏的国家之一。拥有全球20%的人口,但淡水资源仅占全球的7%。中国淡水年消耗量达6000亿立方米,即每人400立方米——为美国人均使用量的1/4,不到国际定义的用水紧张量(waterstress)的一半。淡水短缺对中国水资源密集型产业
A、Theoldstereotypesaboutmenandwomen.B、Thechangingrolesplayedbymenandwomen.C、Thedivisionoflaborbetweenmenand
A、Thetwosidesoftheirbraindevelopsimultaneously.B、Theyarebetterabletoadapttothesurroundings.C、Theirbonesmature
ItispossibleforstudentstoobtainadvanceddegreesinEnglishwhileknowinglittleornothingabouttraditionalscholarlyme
A、Itusesupmuchlessenergythanitdoesindeepthinking.B、Itremainsinactivewithoutburningcaloriesnoticeably.C、Itcon
A、Theytendtofavorlowertemperatures.B、Theysufferfromrapidtemperaturechanges.C、Theyarenotbotheredbytemperatureex
A、Getreadyforacareer.B、Makealotoffriends.C、Setalong-termgoal.D、Behavelikeadults.D对话中男士说,上了大学,言行举止就应该像一个成年人。因此答案
A、Scheduletheirflightsaroundtheanimalvisits.B、Photographthetherapyanimalsattheairport.C、Keepsomeanimalsforther
A、Outdooractivitiescancuremanydeadlydiseases.B、Peoplewithmentaldiseasesbenefitmostfromoutdoorexercise.C、Healthy
随机试题
在教育功能中,()被称为教育的本体功能或教育的固有功能。
下列关于WAV文件和MIDI文件的叙述,错误的是_______。
缓解患者不适的首要护理措施为()。
下列不属于遗忘表现的是
患者,女,15岁。月经周期紊乱,经期长短不一,月经量增多5个月余。肛门检查:子宫正常大小,双侧附件(一),最可能的诊断为
NK细胞主要杀伤
治疗慢性粒细胞性白血病之阴血亏虚证应首选
A.足大趾B.足大趾端C.足中指端D.足第四趾端E.足小指端
驱动调度算法中,()算法可能会随时改变移动臂的运动方向。
WholesalepricesinJulyrosemoresharplythanexpectedandatafasterratethanconsumerprices,【1】thatbusinesseswerestill
最新回复
(
0
)