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
2013-01-18
31
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 are 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方面的担心,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://jikaoti.com/ti/PS8YFFFM
0
考博英语
相关试题推荐
Biologically,thereisonlyonequalitywhichdistinguishesusfromanimals:theabilitytolaugh.Inauniversewhichappearst
Ihatepeoplewho______theendoffilmthatyouhaven’tseenbefore.
Manyparentsareconcernedthattheirchildrendonotconsumetheproperfoodstheyneedtostaystrongandhealthy.Thetruthi
Moderntechnologyandsciencehaveproducedawealthofnewmaterialsandnewwaysofusingoldmaterials.Fortheartistthism
Televisionisoneoftoday’smostpowerfulandwidespreadmeansofmasscommunication.Itdirectlyinfluencesourlivesonboth
Heaskedmetolendhimsomemoney,whichIagreedtodo,______thathepaidmebackthefollowingweek.
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoeverycneonamassbasisortofindthegiftedfewa
TestshaveconfirmedthatfourpeopleinWisconsincontractedthemonkeypoxvirusaftercomingintoclosecontactwithpetprair
Ourape-menforefathershadnoobviousnaturalweaponsinthestruggleforsurvivalintheopen.Theyhadneitherthepowerfult
Unfortunately,thewoman’shat______myviewofthestage.
随机试题
女孩4岁,因高热2小时,惊厥2次,无呕吐腹泻,于1995年8月就诊。发病前曾去公园玩。吃过苹果、葡萄。体检:体温40.2℃,重病容,神志欠清,面色青灰,四肢凉,血压7.5/4.5kPa。病人出现上述症状,首要的处理是
原生植被遭到破坏后出现的次生裸地,与原生裸地()。
患者,女,34岁。四肢反复起水疱伴瘙痒2年,身体易受摩擦部位易发生水疱。体格检查:四肢末端、肘膝关节伸侧见绿豆大小水疱,基底不红,疱壁厚,尼氏征(一),皮损愈合处见瘢痕。皮损组织病理示:表皮下水疱,疱内可见中性粒细胞浸润。确诊该病最具价值的实验室检查为
试戴义齿时,可采用如下方法判断垂直距离是否正确,除了
A.丙磺舒B.克拉维酸C.甲氧苄啶D.氨曲南E.亚叶酸钙与磺胺类药物合用可以双重阻断叶酸合成的是()。
税务咨询的内容较为广泛,其特点是以税收方面的疑难问题为主导,并涉及()等诸多方面专业知识和操作实务。
标志着国内住房贷款业务的正式全面启动的标志的是()。
简述依法治国的主体和对象。
有些未受过大学教育的人成了优秀作家,而更多的优秀作家是受过大学教育的。优秀作家都是敏感而富有想象力的人,只有敏感而富有想象力的人才能写出打动人心的作品。如果以上陈述为真,以下哪一项陈述一定为真?
A、Theycanbeusednormallytomailaletter.B、Theycanonlybeusedforexhibition.C、Theyareusedtoattractmoretourists.
最新回复
(
0
)