首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
DNA Fingerprinting DNA is the genetic material found within the cell nuclei ...
DNA Fingerprinting DNA is the genetic material found within the cell nuclei ...
admin
2020-12-24
38
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.
It can be inferred from Paragraph 5 that DNA fingerprinting
选项
A is costly to the police
B could be a social issue
C is the only way to prove innocence
D has been a profitable business
答案
B
解析
第五段讲DNA指纹识别技术很昂贵。嫌疑犯如不能够把他们的DNA提供给专家, 也不一定能就基于DNA证据的指控成功地为自己辩护,由此可以推断出这有可能成为一 个社会问题
转载请注明原文地址:https://ti.zuoweng.com/ti/QhEQKKKQ
相关试题推荐
Thejournalistiscollectingmaterialforanarticle.A:data B:fabric C:substan
Wehavetoactwithintheexistinglegalframework.()A.limitB.procedureC.statu
Thechefsinthisrestaurantinsistonhighstandardsofmaterials.A:dependon
Wehavetoactwithintheexistinglegalframework.A:limitB:procedureC:status
Wehavetoactwithintheexistinglegalframework.()A.limitB.procedureC.statu
共用题干 第三篇EatMore,WeighLess,LiveLongerClevergeneticdetectiveworkmayh...
Wehavetoactwithintheexistinglegalframework.A.limitB.systemC.procedu
DNAFingerprinting DNAisthegeneticmaterialfoundwithinthecellnuclei...
DNAFingerprinting DNAisthegeneticmaterialfoundwithinthecellnuclei...
DNAFingerprinting DNAisthegeneticmaterialfoundwithinthecellnuclei...
随机试题
491.菲利普斯曲线反映的是通货膨胀与失业率之间的正相关关系。() A.对
心理咨询师掌握心理异常的症状,是为了()。 A.诊断精神障碍和进行治疗 B
(2012年)根据《建设工程消防监督管理规定》,下列建设工程中,需要向公安机关消
下列关于无权代理的说法中,不正确的是()。
阐述人木位的价值取向和社会木位的价值取向的观点主张,并予以分析评价。
输血后发生出血倾向的原因是A.凝血因子被稀释B.血小板因子减少C.溶血D.凝血因子耗损
()是基金营销部门的一项关键性工作。只有仔细地分析投资者,针对不同的市场与客户推出有针对性的基金产品,才能更有效地实现营销目标。A.确定目标市场与投资者B.
Operatunity 1OperatunityisaTVtalentshowforamateuroperasingers.The...
产品出产进度要做到()。A:企业经济利益最大化B:保证交货时期的需要C:均衡出产D:企业损失最小化E:充分利用企业资源
甲、乙、丙三人共同出资80万元设立了一个有限责任公司,其中甲出资40万元,乙出资25万元,丙出资15万元。2010年4月公司成立后,召开了第一次股东会会议...