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
2023-08-16
55
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 impact of smoking lasts less than 30 years.
B、Smoking has a long-term impact on our molecular machinery.
C、Damages caused by smoking can never be cured.
D、Ailments are mainly caused by damage to the DNA.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2929877.html
相关试题推荐
InanewstudyreleasedbyPew,researchersfindthatwhileMillennials(千禧一代
InanewstudyreleasedbyPew,researchersfindthatwhileMillennials(千禧一代
[originaltext]Inthelate1400s,whenChristopherColumbusreturnedtoSpai
[originaltext]Inthelate1400s,whenChristopherColumbusreturnedtoSpai
[originaltext]Inthelate1400s,whenChristopherColumbusreturnedtoSpai
[originaltext]Idon’tthinkIhavetoldyouaboutmytriptoTanglewood’sm
[originaltext]Moderator:Goodevening,everyone!It’sagreathonorofus
[originaltext]Moderator:Goodevening,everyone!It’sagreathonorofus
[originaltext](12)Facebookhashalfabillionusers.That’shugeforapla
[originaltext]So,uh,asJimsaid,JamesPolkwastheeleventhpresident.A
随机试题
Howmenfirstlearnttoinventwordsisunknown:inotherwords,theorigin
Whenhewokeup,theshipwasat_____.A、seaB、oceanC、theseaD、theoceansA冠词。零
Somecollegestudentsdrinktoomuchalc
大理石较耐以下何种腐蚀介质?( )A.硫酸 B.盐酸 C.醋酸 D.碱
燃气输配系统是一个综合设施,其组成除包括燃气输配管网、储配站外,还有()。A:
受体部分激动药特点是()。A:无亲和力,无内在活性 B:有亲和力,有内在活性
阅读案例,回答问题。 在一次《爱我中华》的音乐课上,李老师首先播放了56个民族
共用题干 某通信企业推出一种新业务,为给这项业务定价,该企业测算或预计并获得了
根据耕地占用税的相关规定,纳税人改变原占地用途,不再属于免征或减征情形的,应自改
眼刺激试验使用家兔数量为( )。A.2只 B.3只 C.4只 D.5只
最新回复
(
0
)