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
59
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.
DNA fingerprinting is a technique of
选项
A、grouping DNA strands into structures.
B、segmenting DNA with probes.
C、constructing body tissues by enzymes.
D、identifying a person by comparing DNAs.
答案
D
解析
题意:DNA指纹图谱是一项通过比对DNA鉴定人身份的技术。短文第二段前两句提到“DNA指纹图谱技术有时也叫DNA分型。它是一种通过比对少量DNA进行鉴别的方法”,故选D。
转载请注明原文地址:https://kaotiyun.com/show/BEhd777K
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
Whattimedothephotographyclassesbegin?Philipthinksit’seasytotakephotographsof
SupermarketMostsupermarketsneedaverylargefloorarea,sometimesatleasttentimesasbigasthatofanordinaryshop.
AActionsTakentoHelpBTreatmentofVomitingCTheDifferencebetweenLifeandDeathDMedicalImportanceofFirstAidE
FirstAid1Firstaidisthekindofmedicalthataregiventoavictimofanaccidentorsuddensicknessbeforetrainedmedica
AllpatientsinthestudyrefusetoreceiveanytreatmentbecauseofthepossibilitytoexposetheirHIVstatus.Medicalworker
CharterSchoolsAmericanpubliceducationhaschangedinrecentyears.OnechangeisthatincreasingnumbersofAmericanparents
CharterSchoolsAmericanpubliceducationhaschangedinrecentyears.OnechangeisthatincreasingnumbersofAmericanparents
ManyAmericanwomenhaveapoorknowledgeofcancer.ACOG’seffortstoeducatewomenaboutcancerwillbegreatlyappreciated.
JapanmadeaproposaltoKoreaforincreasingtradebetweentwocountries.
I’mafraidthatyourdaughterhasfailedtogetthroughhermid-termexams.
随机试题
()是表示线性数据结构的。
接诊患者时,医生首先最应注意的是
患者,男,60岁。半个月前,因食生冷瓜果后出现呃逆。现病人呃声低长无力,气怯声低,泛吐清水,脘腹不适,喜温喜按,手足不温,便溏,舌淡苔白,脉细弱。若兼嗳腐吞酸,腹胀,苔腻。宜加
温燥伤肺,气阴两伤证,治宜选用:
霍纳综合征
()可以反映质量活动的实施、验证、审核等签署意见。
公安机关要调整各种社会关系,其中最基本的关系是公安机关与()的关系。
下列关于文学常识的说法中,正确的是()。
简述物价一现金流动机制发挥作用的前提条件。
ByteArrayInputStream以【】作为输入流。
最新回复
(
0
)