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
28
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、They checked the lungs of 16,000 people.
B、They examined the heartbeats of 16,000 smokers.
C、They measured the blood pressure of 16,000 smokers.
D、They looked at blood samples from 16,000 people.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2929878.html
相关试题推荐
[originaltext]ResearchersatHarvardMedicalSchool’saffiliatedHebrewSen
[originaltext](19)Peoplewholiveinareaswithpollutedairincreasethei
[originaltext](19)Peoplewholiveinareaswithpollutedairincreasethei
[originaltext](19)Peoplewholiveinareaswithpollutedairincreasethei
[originaltext]StockpricesretreatedonFridayfollowinganotherweakUSjo
[originaltext]StockpricesretreatedonFridayfollowinganotherweakUSjo
[originaltext](12-1)Swedishfathersfromnextyearwillreceiveathirdmo
[originaltext]Watchinganotherpersonshivercancauseourowntemperature
[originaltext]Watchinganotherpersonshivercancauseourowntemperature
[originaltext]Watchinganotherpersonshivercancauseourowntemperature
随机试题
"Whereistheuniversity?"isthequestionmanyvisitorstoCambridgeask.B
胸腔闭式引流治疗气胸的指征包括()A.不稳定型气胸 B.明显呼吸困难者
一艘满载化学物品的轮船撞上桥墩,轮船上面的化学物品流入河中。有人传言,其造成的污
阴谷穴是足少阴肾经的A、原穴 B、络穴 C、经穴 D、郄穴 E、合穴
A.滋养肾阴,佐以潜阳 B.温肾扶阳 C.滋阴补肾 D.阴阳双补 E.温
A.大细胞性贫血B.正常细胞性贫血C.小细胞低色素性贫血D.单纯小细胞性贫血E.
银:暗淡()A.金:耀眼 B.铁:生锈 C.铝:合金 D.硅:明亮
按伯克威兹的观点,侵犯行为的发生,主要与()有关。单选A.文化水平 B.
某土石方工程,基础为C20混凝土代行基础,基础垫层为C10,垫层宽度为1.4m,
干管及支管的末端连接城市或大型工业企业,作为供应区的气源点的是()。A、长距离
最新回复
(
0
)