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
2023-08-17
43
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/2932624.html
相关试题推荐
[originaltext]Manyareasaroundtheworldsufferfromfrequentlossofelec
[originaltext]Manyareasaroundtheworldsufferfromfrequentlossofelec
[originaltext]Manyareasaroundtheworldsufferfromfrequentlossofelec
[originaltext]W:Asinglecigarettesoldonastreetcornermaynotcostalot;
[originaltext]IfyouareinterestedinstudyingatanAmericanuniversity,
[originaltext]Cleanairisimportanttogoodhealth.Iftheaircontainsim
[originaltext][9]VisitorstoBritainaresometimessurprisedtolearnthat
[originaltext][9]VisitorstoBritainaresometimessurprisedtolearnthat
[originaltext]W:[5]ProfessorSmith,Iwonderifyoucanfillmeinonyourlec
[originaltext]W:[5]ProfessorSmith,Iwonderifyoucanfillmeinonyourlec
随机试题
ShouldUrbanGrowthbeRestricted?VocabularyandExpressionsrepercussionA
TheEffectivenessofaPerson1.believethereisnosuchthingas
Forthoseofusluckyenoughtoalwayshaveenoughfoodandwater,itmaybe
______,LaborParty’smajoritywasreducedintheParliament.[originaltext]P
高层建筑内的消防水池总容量超过()时,应分成两个能独立使用的消防水池。A.
证券市场供给的决定因素有( ) Ⅰ.上市公司质量 Ⅱ.上市公司数量 Ⅲ.
慢性排斥反应的特点是A.突发寒战高热 B.术后1~2周发生 C.术后24小时
11岁男童,因双下肢皮肤出现紫红色出血点来院就诊,经检查确诊为过敏性紫癜。目前该
某场地采用多桩型复合地基,采用增强体1和增强体2,见下图,当采用多桩(取增强体1
中国传统戏剧多有剧目涉及中国古代法律观念和法律制度。对此,下列哪些说法是成立的?
最新回复
(
0
)