首页
登录
职称英语
[originaltext] Researchers at Harvard Medical School’s affiliated Hebrew Sen
[originaltext] Researchers at Harvard Medical School’s affiliated Hebrew Sen
游客
2024-04-10
40
管理
问题
Researchers at Harvard Medical School’s affiliated Hebrew SeniorLife Institute for Aging Research say smoking leaves a long-term signature on DNA.
(23)"Our study has found compelling evidence that smoking has a long-lasting impact on our molecular machinery, an impact that can last more than 30 years," said Roby Joehanes, first author on the study. "The encouraging news is that once you stop smoking, the majority of DNA methylation signals return to never smoker levels after five years, which means your body is trying to heal itself of the harmful impacts of tobacco smoking. "
Ailments, including heart disease and cancer, are believed to be at least partially caused by damage to the DNA.
(24)For the study, the researchers looked at blood samples from 16,000 people. They found that for most, the DNA damage caused by smoking faded for people who had kicked the habit for five years. Some of the damage appeared to be permanent.
The damage to DNA is a result of a process called methylation, which changes how DNA functions, possibly leading to cancer and other illnesses. The researchers say that smokers, among those studied, saw changes to more than 7,000 genes or about one-third of known human genes.
"These results are important because methylation, as one of the mechanisms of the regulation of gene expression, affects what genes are turned on, which has implications for the development of smoking-related diseases,"(25)said Dr. Stephanie J. London, last author and deputy chief of the epidemiology branch at the National Institute of Environmental Health Sciences, National Institutes of Health. " Equally important is our finding that even after someone stops smoking, we still see the effects of smoking on their DNA. "
Smoking is the leading cause of preventable illness and kills an estimated 480,000 Americans annually, the Centres for Disease Control and Prevention said. Smoking is believed to take the lives of more than 6 million people every year across the globe, mostly through cancer, heart disease and lung disease.
In the United States, smoking levels have dropped considerably, with only an estimated 15 percent of the adult population engaging in the habit.
Questions 23 to 25 are based on the recording you have just heard.
23. According to Roby Joehanes, what has the study found?
24. What did the researchers do for the study?
25. What did Dr. Stephanie J. London say about the people who stopped smoking?
选项
A、The effects of smoking on their DNA still exists.
B、The damage to their DNA will be cured one year later.
C、The function of their DNA has been changed.
D、The chance of having cancer is still high.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3548884.html
相关试题推荐
[originaltext]"Informationwantstobefree,"thesayinggoes.(23)Butthed
[originaltext]Dreamsareexpressionsofthoughts,feelingsandeventsthat
[originaltext]Dreamsareexpressionsofthoughts,feelingsandeventsthat
[originaltext]Mostyoungwomenbelievetheywillachieveabalancebetween
[originaltext]M:YouknowIwillbethemaintalkerintheclassroomdiscussion
[originaltext]M:YouknowIwillbethemaintalkerintheclassroomdiscussion
[originaltext]M:Mrs.Hudson,anewresearchshowsthatevenjustfiveminutes
[originaltext]M:Mrs.Hudson,anewresearchshowsthatevenjustfiveminutes
[originaltext]W:Ihaveaveryimportantappointmenttoattendthisafternoon.
[originaltext]W:Ihaveaveryimportantappointmenttoattendthisafternoon.
随机试题
Inthissection,youwillheararadiotalk.Thetalkwillbereadonlyonce.Fo
CaliforniaStateLawrequiresthatallbicycleridersunderage18wearprot
甲事业单位为财政全额拨款的事业单位(以下简称甲单位),自2004年起,实行国
与硅酸盐水泥相比,矿渣水泥具有的特点包括()。A.早期强度低.后期强度增长率较
关于集料密度,下列说法正确的是() A.表观密度<表干密度 B.表观密度
A.医疗事故赔偿 B.申请再次鉴定 C.处理医疗事故工作 D.首次医疗事故
判别代谢性酸中毒时较好指标是()A.HCOB.pHC.CO结合力D.标准碳酸氢
(2018年真题)老范是低保救助对象。老范想依靠自己的努力,减少对低保救助的依赖
道氏理论的主要原理包括()。A.市场价格指数可以解释和反映市场的大部分行为
用一句话表达,(),就是对咨询师“品格”素质的要求。 (A)努力满足求
最新回复
(
0
)