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
DNA Fingerprinting DNA is the genetic material found within the cell nuclei of all living things. In mammals(哺乳动物)the strand
DNA Fingerprinting DNA is the genetic material found within the cell nuclei of all living things. In mammals(哺乳动物)the strand
admin
2013-08-25
71
问题
DNA Fingerprinting
DNA is the genetic material found within the cell nuclei of all living things. In mammals(哺乳动物)the strands of DNA are grouped into structures called chromosomes(染色体). With the exception of identical twins, the complete DNA of each individual is unique.
DNA fingerprinting is sometimes called DNA typing. It is a method of identification that compares bits of DNA. A DNA fingerprint is constructed by first drawing out a DNA sample from body tissue or fluid such as hair, blood, or saliva(唾液). The sample is then segmented using enzymes(酶), and the segments are arranged by size. The segments are marked with probes and exposed on X-ray film, where they form a pattern of black bars—the DNA fingerprint. If the DNA fingerprints produced from two different samples match, the two samples probably came from the same person.
DNA fingerprinting was first developed as an identification technique in 1985. Originally used to detect the presence of genetic diseases, it soon came to be used in criminal investigations and legal affairs. The first criminal conviction based on DNA evidence in the United States occurred in 1988. In criminal investigations, DNA fingerprints derived from evidence collected at the crime scene are compared to the DNA fingerprints of suspects. Generally, courts have accepted the reliability of DNA testing and admitted DNA test results into evidence. However, DNA fingerprinting is controversial in a number of areas; the accuracy of the results, the cost of testing, and the possible misuse of the technique.
The accuracy of DNA fingerprinting has been challenged for several reasons. First, because DNA segments rather than complete DNA strands are "fingerprinted"; a DNA fingerprint may not be unique; large-scale research to confirm the uniqueness of DNA fingerprinting test results has not been conducted. In addition, DNA fingerprinting is often done in private laboratories that may not follow uniform testing standards and quality controls. Also, since human beings must interpret the test, human error could lead to false results.
DNA fingerprinting is expensive. Suspects who are unable to provide their own DNA to experts may not be able to successfully defend themselves against charges based on DNA evidence.
Widespread use of DNA testing for identification purposes may lead to the establishment of a DNA fingerprint database.
If two sisters are identical twins, their complete DNAs are
选项
A、the same.
B、unique.
C、different.
D、similar.
答案
A
解析
题意:如果两姐妹是同卵双胞胎,那么她们的完整DNA是相同的。短文第一段最后一句提到“除同卵双胞胎之外,每个人的完整DNA都是独一无二的”,也就是说同卵双胞胎的是一样的,故选A。
转载请注明原文地址:https://kaotiyun.com/show/6Ehd777K
本试题收录于:
职称英语卫生类A级题库职称英语分类
0
职称英语卫生类A级
职称英语
相关试题推荐
Theytriedtheirbesttoresolvetheresidualproblems.
Thepassageindicatesthatancienttreatmentsforinjuryanddiseasewere______.WhichofthefollowingstatementsisNOTtrue
U.S.,EuropeanDrugOfficialsApproveInhaledInsulinAformofinsulinforpeoplewithdiabetestotakebymouthisexpectedto
GenerationGapAfewyearsago,itwasfashionabletospeakofagenerationgap,adivisionbetweenyoungpeopleandtheirel
Asmoreandmorematerialfromotherculturesbecameavailable,Europeanscholarscametorecognizeevengreatercomplexityinm
Asmoreandmorematerialfromotherculturesbecameavailable,Europeanscholarscametorecognizeevengreatercomplexityinm
HowmanybabiesarebornwithlowbirthweightinthedevelopedcountrieseveryyearaccordingtoWHO?Howmanypercentofbabi
A.CommonSecondaryLungCancersB.TheAdvantagesBroughtaboutbyRoutineChestCheckupC.RelationshipBetweenMortalityRate
Policeofficersworkingonthemurderhavequestionedhundredsoffamilies.
Notcontentwithitsdoubtfulclaimtoproducecheapfoodforourownpopulation,thefactoryfarmingindustryalsoarguesthat
随机试题
某单位的办公室秘书小马接到领导的指示,要求其提供一份最新的中国互联网络发展状况统计情况。小马从网上下载了一份未经整理的原稿,按下列要求帮助他对该文档进行排版操作并按指定的文件名进行保存。打开考生文件夹下的文档“Word素材.docx”,将其另存为“Wo
维持人体内环境稳定最重要的神经内分泌器官是
撞击式分级颗粒物采样器把粒径不同的颗粒物分别捕获在各段捕集板上的原理是
对不予医师执业注册有异议的可以
属于桥梁附属设施的是()。
工程预付款的预付时间应不迟于()。
账簿中书写的文字和数字一般应占格距的大小是()。
下列各句中,句意明确,没有语病的一项是()
()是重庆火锅的主要原料。
第一个软件开发项目对工作、工作之间的逻辑关系和工作持续时间都不确定,于是项目经理对项目费用、时间、效能三方面进行了综合分析,对可能发生的风险作出概率估计。这种时间管理的方法属于网络计划技术,除此之外还可以采用其他技术方法进行时间管理。第二个软件开
最新回复
(
0
)