首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The last decade has seen a tremendous expansion of scientific knowledge in human genetics. Our understanding of human genes and
The last decade has seen a tremendous expansion of scientific knowledge in human genetics. Our understanding of human genes and
admin
2013-01-29
40
问题
The last decade has seen a tremendous expansion of scientific knowledge in human genetics. Our understanding of human genes and of the genetic basis of disease has grown dramatically. Currently, more than 4,000 diseases are known to be genetic and are passed on in families. Moreover, it is now known that alterations in our genes play a role in such common conditions as heart disease, diabetes, and many types of cancer.
The identification of disease-related genes has led to an increase in the number of available genetic tests that detect disease or an individual’s risk of disease. New tests arc being developed to detect colon cancer, breast cancer, and other conditions. Scientists are concerned not only that gene tests offered are reliable, but also that patients and health care professionals understand the limitations of such testing. The disclosure of test results could inflict psychological harm to a patient if safe and effective interventions are not also available.
Gene testing involves examining a person’s DNA-taken from cells "in a sample of blood or, occasionally, from other body fluids or tissues—for some anomaly that flags a disease or disorder. In addition to studying genes, genetic testing in a broader sense includes biochemical tests for the presence or absence of key proteins that signal aberrant genes.
The most widespread type of genetic testing is newborn screening. Each year in the United States, four million newborn infants have blood samples tested for abnormal or missing gene products. Some tests look for abnormal arrangements of the chemical bases in the gene itself, while other tests detect inborn errors by verifying the absence of a protein that the cell needs to function normally. Carrier testing can be used to help couples to learn if they carry—and thus risk passing to their children. Genetic tests—biochemical and DNA-based—also are widely available for the prenatal diagnosis of conditions such as Down syndrome.
Much of the current excitement in gene testing centers on predictive gene testing: tests that identify people who are at risk of getting a disease, before any symptoms appear. Tests are already available in research programs for some two dozen diseases, and as more disease genes are discovered, more gene tests can be expected.
Tests for a few rare cancers are already in clinical use. Predictive gene tests for more common types of cancer are still primarily a research tool, difficult to execute and available only through research programs to small numbers of people who have a strong family history of disease. But the field of gene testing is evolving rapidly, with new genes being discovered almost daily and innovations in testing arriving almost as quickly.
Scientists argue that the genetic testing is not perfect partly because______.
选项
A、it chiefly centers on predictive gene testing
B、the health care for patients is not professional
C、it may arouse the patients’ discomfort mentally
D、it involves the DNA test and biochemistry
答案
C
解析
这是一道细节考察题。在文中第2段第3行中:一些科学家不仅担心所提供的基因测试是否可靠,而且担心病人和卫生保健专业人员是否意识到基因测试的局限性。我们得知科学家有两疗面的担心,因此可以理解为科学家认为测试并不完美。一是担心测试的可靠性,二是担心测试结果有可能对病人造成不良影响。因此根据原文信息我们选择C为正确答案。
转载请注明原文地址:https://www.kaotiyun.com/show/TY1O777K
0
考博英语
相关试题推荐
Thereisaquestion,however,thatmustbeansweredbeforethissynthesisisattempted,namely,whicharethesocialtendencies
Unlikemostsports,whichevolvedovertimefromstreetgames,basketballwasdesignedbyonemantosuitaparticularpurpose.
Securityandcommodityexchangesaretradingpostswherepeoplemeetwhowishtobuyandsell.Theexchangesthemselvesdonotr
(59)ThreeGoogleexecutiveswereconvictedWednesdayofviolatingItalianprivacylawsinarulingthatthecompanydenounceda
Somejournalistsoftenoverstatethesituationsothattheirnewsmaycreateagreat______
PitythosewhoaspiretoputtheinitialsPhDaftertheirnames.After16yearsofcloselysupervisededucation,prospectivedoc
Themostexcitingkindofeducationisalsothemost.Nothingcan【C1】______thejoyofdiscoveringforyourselfsomethingthatis
FrancoisJacobwrotethat"anageorcultureischaracterizedlessbytheextentofitsknowledgethanbythenatureoftheques
U.S.airlinescouldslash70,000morejobsiftherewerewarwithIraqandtheU.S.governmentdidnotgivetheindustry,moreh
Predictionsoflargepopulationsofrobotsinindustryhaveyettocometrue.Foradecadeormore,manufacturersofbigrobots
随机试题
在Excel2003中,要将当前工作簿中的工作表移动到另一个工作簿中,正确的操作是_____。
A.分离排出B.溶解吸收C.机化D.包裹E.钙化肺泡腔内少量纤维素渗出物可
血管性血友病可分为
治疗链霉素急性毒性反应时,应立即注射
男性,74岁,右侧腹股沟区可复性肿块8年。查体:病人直立时。在腹股沟内侧端、耻骨结节上外方有一4cm×4cm半球形肿物,未进入阴囊,平卧后自行消失。该病人最有效的治疗方法是
在房地产市场调查中,收集一手资料的方法有()。[2005年考题]
下列哪一项不属于购买健康保险应遵循的原则?( )
与证券价格有关的“可知”的资料包括( )。
用标准法计算操作风险监管资本时,各业务线不同的操作风险资本要求系数β代表()。
教师运用一些醒目的文字、符号、色彩对比等对学生行为进行的强化是()。
最新回复
(
0
)