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
2024-04-08
25
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/3546138.html
相关试题推荐
[originaltext]Goodmorning,today’slectureisaboutaninterestingtopic,
[originaltext]Goodmorning,today’slectureisaboutaninterestingtopic,
[originaltext](I):(16)Finallytonight,thetiebetweeneducatingourchildren
[originaltext](I):(16)Finallytonight,thetiebetweeneducatingourchildren
[originaltext](I):(16)Finallytonight,thetiebetweeneducatingourchildren
[originaltext]"CharlieGriffin’sBritishpigwasinmypotatoesagain!"bel
[originaltext]Theworldhasbecomenoisierplace,sayexpertsattheLibrar
[originaltext]Theworldhasbecomenoisierplace,sayexpertsattheLibrar
[originaltext]M:(8)Jean,wereyouabletogetthatreportalltypedup?W:(8)
[originaltext]M:(8)Jean,wereyouabletogetthatreportalltypedup?W:(8)
随机试题
CultureShockI.Thedefinitionofcultureshock—feeli
女性,40岁,患类风湿关节炎数年,查血红蛋白80g/L,白细胞、血小板正常。血清
某C20钢筋混凝土现浇板跨度为3.8m,其模板拆除时混凝土强度设计无具体要求,当
癫病与郁病的鉴别关键是有无A.自我控制能力 B.心情抑郁、情绪不宁 C.急躁
Thechangeinthatvillagewasmiraculou
关于催产素静脉滴注,下列正确的是()。A.用于协调性子宫收缩乏力,以加强宫缩
在以刺激为基础的模式中,()属于组织结构和气候的压力源因素。 A.晋升过快
2004年广播、电视宣传基本情况表 项目 节 目
慢性汞中毒患者病情发展到一定程度时的典型表现是()A.口腔炎 B.易兴奋症
单位对会计人员的工作岗位要有计划地轮岗。()
最新回复
(
0
)