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 the strands of
DNA Fingerprinting DNA is the genetic material found within the cell nuclei of all living things. In mammals the strands of
admin
2013-11-25
72
问题
DNA Fingerprinting
DNA is the genetic material found within the cell nuclei of all living things. In mammals the strands of DNA are grouped into structures called chromosomes. With the exception of identical siblings(as in 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. The sample is then segmented using enzymes, 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 all 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
According to the essay, we can find chromosomes______.
选项
A、in a fish
B、in a tree
C、in a sheep
D、in a rock
答案
C
解析
题意:根据短文所述,我们能……找到染色体。根据文章第一段第二句“in mammals…called chromosomes”可知,哺乳动物的DNA链组合形成称作染色体的结构,四个选项中只有C项sheep是哺乳动物,故本题选C。
转载请注明原文地址:https://kaotiyun.com/show/2bhd777K
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
Ifyouhavelostabook,callthisnumber.
TheUSspendstwiceasmuchonhealthcareasotherrichcountries.Theotherfourcountriesprovidebetterhealthcarethanth
Choosingatopicforresearchisimportantinthatyouwillputagreatdealoftimeandenergyintoit.Youcanresearchthet
CancerChatisdifferentfromotherforumsinthatCancerHelpUKisawebsitethat
TheattackonFortSumternearCharlestonprovokedasharpresponsefromtheNorth,whichledtotheAmericanCivilWar.
ManyWomenWhoBeatCancerDon’tChangeHabitsManywomenwhobattlebreastcancerwilltellyouit’salife-changingexperience
SomeSundaynewspapersmaybelongtothesamepublishingcompanybutarenoteditedbythesamegroupofpeople.Itisobvious
Theresultsofthenewstudyareunexpected.Allthosepeoplewhotookpartinthestudyreceivedvitaminsandminerals.
WhatIsAnthrax?There’sbeenalotoftalkaboutanthraxonthenewslately.Somepeoplearewordedthatanthraxmaybeconn
Youmustshineyourshoes.
随机试题
公司将于今年举办“创新产品展示说明会”,市场部助理小王需要将会议邀请函制作完成,并寄送给相关的客户。现在,请你按照如下需求,在Word.docx文档中完成制作工作:在“尊敬的”文字后面,插入拟邀请的客户姓名和称谓。拟邀请的客户姓名在考生文件夹下的“通
Becauseofthe______emphasisplacedonclassroomwork,theinstructorwillreportyourabsencetotheadviser.
患者,男性,24岁,发热、咳脓痰2周,体温波动于38~39℃。X线片示右肺下叶大片致密影,右胸膜腔积液。最常见的致病菌是
肛裂的主要特点为
于某为甲省乙市丙县的民营企业家,是该省、市、县三级人大代表。于某因犯故意伤害罪被丙县公安局立案侦查,县公安局经审查认为应将于某逮捕,于是便向县人民检察院提请逮捕。对此。如果在人大闭会期间,人民检察院下列哪种做法是正确的?()
幕墙用单层铝板厚度不应小于()mm。
工业企业制造产品领用的原材料一般应该计入()。
某硬磁盘有5个记录面,记录面上有效记录区域的内径为10cm,外径为30cm。磁道上记录的位密度为250bit/mm,道密度为10道/mm,每一磁道上分为16个扇区,每个扇区记录1KB(字节),磁盘旋转速度为10000转/分。则该硬磁盘的非格式化容量约为(2
软件测试是保证软件质量的重要手段,而软件测试的主要和重要的测试方法是通过测试数据和【】的设计来实现。
Nexttermthestudents(have)______tenEnglishclassesperweek.
最新回复
(
0
)