共用题干第二篇DNA FingerprintingDNA 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 identicaltwins,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 DAN 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 pat- tern of black bars一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 investiga- tions,DNA fingerprints derived from evidence collected at the crime scene are compared to the DNA finger- prints of suspects.Generally,courts have accepted the reliability of DNA testing and admitted DNA test re- sults 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 segmentsrather 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.People question the reliability of DNA fingerprinting for________.A:the subjective interpretation of test resultsB:its complex procedureC:its large scale researchD:its uniform testing standards
共用题干
第二篇
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 DAN 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 pat-
tern of black bars一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 investiga-
tions,DNA fingerprints derived from evidence collected at the crime scene are compared to the DNA finger-
prints of suspects.Generally,courts have accepted the reliability of DNA testing and admitted DNA test re-
sults 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.
第二篇
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 DAN 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 pat-
tern of black bars一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 investiga-
tions,DNA fingerprints derived from evidence collected at the crime scene are compared to the DNA finger-
prints of suspects.Generally,courts have accepted the reliability of DNA testing and admitted DNA test re-
sults 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.
People question the reliability of DNA fingerprinting for________.
A:the subjective interpretation of test results
B:its complex procedure
C:its large scale research
D:its uniform testing standards
A:the subjective interpretation of test results
B:its complex procedure
C:its large scale research
D:its uniform testing standards
参考解析
解析：本题是事实细节判断题。文章第一段最后一句话“With the exception of identical twins, the complete DNA of each individual is unique."，意思是：除生物姊妹体外（如完全相同的双胞 胎），每一个人的整条DNA是独一无二的。说明双胞胎的DNA是相同的。故选A。
文章第二段对DNA指纹识别进行了解释，可知DNA指纹识别法有时也称DNA印记 法。它是一种通过对比DNA片段来进行辨认识别的方法。故选D。
由文章第三段前两句话可知DNA技术最初是被用来检测基因疾病的，故选D。
文章倒数第三段讲述了人们质疑DNA指纹识别的三个原因：DNA指纹识别针对的是 DNA片段而不是整个DNA系统; DNA指纹识别是在私人实验室进行的很可能没有遵循相同 的鉴定标准；鉴定结果是人为分析的，人为失误可能会导致鉴定出错。四个选项中A项符合第 三条质疑，故选A。
本题是推理判断题。第五段意思是：DNA指纹颇有价值。如果犯罪嫌疑人不能将自己 的DNA提供给专家，他/她就很可能没有确凿的证据证明自己无罪。由此可以推断出，DNA 指纹对警察破案来说，尤为显得珍贵。故选A。
文章第二段对DNA指纹识别进行了解释，可知DNA指纹识别法有时也称DNA印记 法。它是一种通过对比DNA片段来进行辨认识别的方法。故选D。
由文章第三段前两句话可知DNA技术最初是被用来检测基因疾病的，故选D。
文章倒数第三段讲述了人们质疑DNA指纹识别的三个原因：DNA指纹识别针对的是 DNA片段而不是整个DNA系统; DNA指纹识别是在私人实验室进行的很可能没有遵循相同 的鉴定标准；鉴定结果是人为分析的，人为失误可能会导致鉴定出错。四个选项中A项符合第 三条质疑，故选A。
本题是推理判断题。第五段意思是：DNA指纹颇有价值。如果犯罪嫌疑人不能将自己 的DNA提供给专家，他/她就很可能没有确凿的证据证明自己无罪。由此可以推断出，DNA 指纹对警察破案来说，尤为显得珍贵。故选A。
相关考题：
共用题干第二篇DNA FingerprintingDNA 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 identicaltwins,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 DAN 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 pat- tern of black bars一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 investiga- tions,DNA fingerprints derived from evidence collected at the crime scene are compared to the DNA finger- prints of suspects.Generally,courts have accepted the reliability of DNA testing and admitted DNA test re- sults 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 segmentsrather 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 arev________.A:the sameB:uniqueC:differentD:similar
共用题干第二篇DNA FingerprintingDNA 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 identicaltwins,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 DAN 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 pat- tern of black bars一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 investiga- tions,DNA fingerprints derived from evidence collected at the crime scene are compared to the DNA finger- prints of suspects.Generally,courts have accepted the reliability of DNA testing and admitted DNA test re- sults 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 segmentsrather 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 was first used in________.A:criminal investigationB:animal reproductionC:private laboratoriesD:genetic disease detection
共用题干第二篇DNA FingerprintingDNA 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 identicaltwins,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 DAN 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 pat- tern of black bars一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 investiga- tions,DNA fingerprints derived from evidence collected at the crime scene are compared to the DNA finger- prints of suspects.Generally,courts have accepted the reliability of DNA testing and admitted DNA test re- sults 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 segmentsrather 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________.A:grouping DNA strands into structuresB:segmenting DNA with probesC:constructing body tissues by enzymesD:identifying a person by comparing DNAs
共用题干Cell Phone Lets Your Secret OutYour cell phone holds secrets about you.Besides the names and________(51)that you'ye pro- grammed into it,traces of your DNA linger on the device,according to a new study.DNA is genetic material that_________(52)in every cell.Like your fingerprint, your DNA is unique to you一_______(53)you have an identical twin.Scientists today routinely analyze DNA in blood, saliva,or hair left__________(54)at the scene of a crime.The results often help detectives identify________(55)and their victims.Your cell phone can reveal more about you ________(56)you mightthink.Meghan J.McFadden,a scientist at McMaster University in Hamilton,Ontario,heard about a crime in which the suspect bled onto a cell phone and later dropped the_________(57).This made her wonder whether traces of DNA lingered on cell phones even when no blood was involved._________(58)she and colleague Margaret Wallace of the City University of New York analyzed the flip一open phones of 10 volun- teers.They used swabs to collect__________( 59)traces of the users from two parts of the phone:the outside,where the user holds it,and the_________(60),which is placed at the user's ear.The scientists scrubbed the phones using a solution made mostly________(61)alcohol.The aim of washing was to remove all detectable traces of DNA.The owners got their phones__________(62)foranother week.Then the researchers collected the phones and repeated the swabbing of each phone once more。The scientists discovered DNA that_________ (63)to the phone's speaker on each of the phones. Better samples were collected from the outside of each phone,but those swabs also picked up DNA that be- longed to other people who had apparently also handled the phone.________(64),DNA showed up even in swabs that were taken immediately after the phones were scrubbed.That suggests that washing won't removeall traces of evidence from a criminal's device.So cell phones can now be added to the.__________(65)of clues that can clinch a crime-scene investigation._________(63)A:was givenB:belongedC:was ownedD:became
Cell Phone Lets Your Secrets Out Your cell phone holds secrets about you.Besides the names and numbers that you've programmed into it, ______traces____(51) of your DNA linger (遗留) on thedevice according to a new study DNA is genetic (遗传的)material _____that_____ (52) appears in every cell. Like your fingerprint, yourDNA is _____unique______ (53) to you——unless you have an identical twin. Scientiststoday analyze DNA in blood, saliva (唾液), orhair left ____behind_______ (54) at the scene of a crime. The results oftenhelp detectives identify ____criminals______ (55) and their victims. Your cellphone can reveal more about you ____than_____ (56) you might think. Meghan J. McFadden, a scientist at McMasterUniversity in Hamilton, Ontario, heard about a crime in which the suspect bledonto a cell phone and later dropped the____device_____ (57). This made herwonder whether traces of DNA lingered on cell phones一evenwhen no blood was___involved_____(58). She and colleague Margaret Wallace ofthe City University of NewYork analyzed the flip-open phones(翻盖手机)of10 volunteers. They used swabs (药签) tocollect _____invisible___ (59) traces of the users from two parts of the phone:the outside, where the user ____holds_____(60) it, and the speaker which isplaced at the user's ear The scientists cleaned the phones using asolution made mostly__of____(61) alcohol. The aim of washing was to remove alldetectable traces of DNA. The owners got their phones back for another week.Then the researchers ___returned________ (62) the phones and cleaned each phoneonce more. The scientists discovered DNA that _____belonged______(63) to the phone's speaker on each of the phones. Better samples werecollected from the outside of each phone, but those swabs also picked up DNAthat belonged to other people who had apparently also ____handed______ (64) thephone Surprisingly, DNA showed up even in swabsthat were taken immediately after the phones were scrubbed. That suggests thatwashing won't remove all traces of ___evidence________ (65) from a criminal'sdevice. So cell phones can now be added to the list of clues that can clinch (确定)a crime-scene investigation.文章(41~55) A. name B.pictures C. shapes D. traces
共用题干Unlocking the Human Genome（基因组）1 A project to unlock secrets一what scientist could resist that challenge?This is what many scientists are doing as they work on the Human Genome Project.The aim of the project is to decode（破译）all of the some 100,000 genes in the human body. Scientists are using DNA fingerprinting techniques to do the decoding.2 DNA is the substance found in the chromosomes（染色体）of a cell. A chromosome is a chain of genes.Each gene carries a piece of genetic information.At any one moment in a cell, thousands of genes are turned on and off to produce proteins（蛋白质）.The challenge for scientists is to find out what role each gene plays in protein production.At some point this decoding will be complete.Then scientists will have a map of an ideal genome,or a picture of the total genetic nature of a human being.The ideal genome is called a consensus（交感）genome. Everything works well in a consensus genome.3 But no one in the world has a consensus genome.Everyone's genome is different from the ideal. These differences are referred to as genetic mutations（突变）.Genetic mutations in a person's genome mean that the person has a greater than average chance of suffering from health problems.Some problems are not life-threatening.These would include things like colorblindness,or mild headaches.Other problems are serious,such as heart disease,or cancer.4 It will take years to identify the role of each of the 100,000 genes.The short-term goal of the project is to find the physical and mental health problems a person is likely to encounter during his or her lifetime.The long-term goal is to have each person live a longer,healthier life.Paragraph 2_________A:How does DNA work?B:What is the Human Genome Project about?C:How are the DNA samples collected?D:What are the goals of the Human Genome Project?E:What is the role of each gene?F:What are the consequences of genetic mutations?
共用题干Unlocking the Human Genome（基因组）1 A project to unlock secrets一what scientist could resist that challenge?This is what many scientists are doing as they work on the Human Genome Project.The aim of the project is to decode（破译）all of the some 100,000 genes in the human body. Scientists are using DNA fingerprinting techniques to do the decoding.2 DNA is the substance found in the chromosomes（染色体）of a cell. A chromosome is a chain of genes.Each gene carries a piece of genetic information.At any one moment in a cell, thousands of genes are turned on and off to produce proteins（蛋白质）.The challenge for scientists is to find out what role each gene plays in protein production.At some point this decoding will be complete.Then scientists will have a map of an ideal genome,or a picture of the total genetic nature of a human being.The ideal genome is called a consensus（交感）genome. Everything works well in a consensus genome.3 But no one in the world has a consensus genome.Everyone's genome is different from the ideal. These differences are referred to as genetic mutations（突变）.Genetic mutations in a person's genome mean that the person has a greater than average chance of suffering from health problems.Some problems are not life-threatening.These would include things like colorblindness,or mild headaches.Other problems are serious,such as heart disease,or cancer.4 It will take years to identify the role of each of the 100,000 genes.The short-term goal of the project is to find the physical and mental health problems a person is likely to encounter during his or her lifetime.The long-term goal is to have each person live a longer,healthier life.Genetic mutations in a person's genome may affect_________.A:that person's healthB:a scientific answerC:scientific researchersD:the genesE:the functionF:the size
共用题干Unlocking the Human Genome（基因组）1 A project to unlock secrets一what scientist could resist that challenge?This is what many scientists are doing as they work on the Human Genome Project.The aim of the project is to decode（破译）all of the some 100,000 genes in the human body. Scientists are using DNA fingerprinting techniques to do the decoding.2 DNA is the substance found in the chromosomes（染色体）of a cell. A chromosome is a chain of genes.Each gene carries a piece of genetic information.At any one moment in a cell, thousands of genes are turned on and off to produce proteins（蛋白质）.The challenge for scientists is to find out what role each gene plays in protein production.At some point this decoding will be complete.Then scientists will have a map of an ideal genome,or a picture of the total genetic nature of a human being.The ideal genome is called a consensus（交感）genome. Everything works well in a consensus genome.3 But no one in the world has a consensus genome.Everyone's genome is different from the ideal. These differences are referred to as genetic mutations（突变）.Genetic mutations in a person's genome mean that the person has a greater than average chance of suffering from health problems.Some problems are not life-threatening.These would include things like colorblindness,or mild headaches.Other problems are serious,such as heart disease,or cancer.4 It will take years to identify the role of each of the 100,000 genes.The short-term goal of the project is to find the physical and mental health problems a person is likely to encounter during his or her lifetime.The long-term goal is to have each person live a longer,healthier life.The Human Genome Project is trying to map all_________that make us human.A:that person's healthB:a scientific answerC:scientific researchersD:the genesE:the functionF:the size
共用题干Unlocking the Human Genome（基因组）1 A project to unlock secrets一what scientist could resist that challenge?This is what many scientists are doing as they work on the Human Genome Project.The aim of the project is to decode（破译）all of the some 100,000 genes in the human body. Scientists are using DNA fingerprinting techniques to do the decoding.2 DNA is the substance found in the chromosomes（染色体）of a cell. A chromosome is a chain of genes.Each gene carries a piece of genetic information.At any one moment in a cell, thousands of genes are turned on and off to produce proteins（蛋白质）.The challenge for scientists is to find out what role each gene plays in protein production.At some point this decoding will be complete.Then scientists will have a map of an ideal genome,or a picture of the total genetic nature of a human being.The ideal genome is called a consensus（交感）genome. Everything works well in a consensus genome.3 But no one in the world has a consensus genome.Everyone's genome is different from the ideal. These differences are referred to as genetic mutations（突变）.Genetic mutations in a person's genome mean that the person has a greater than average chance of suffering from health problems.Some problems are not life-threatening.These would include things like colorblindness,or mild headaches.Other problems are serious,such as heart disease,or cancer.4 It will take years to identify the role of each of the 100,000 genes.The short-term goal of the project is to find the physical and mental health problems a person is likely to encounter during his or her lifetime.The long-term goal is to have each person live a longer,healthier life.Decoding the human genome is a challenge to_________.A:that person's healthB:a scientific answerC:scientific researchersD:the genesE:the functionF:the size
共用题干Unlocking the Human Genome（基因组）1 A project to unlock secrets一what scientist could resist that challenge?This is what many scientists are doing as they work on the Human Genome Project.The aim of the project is to decode（破译）all of the some 100,000 genes in the human body. Scientists are using DNA fingerprinting techniques to do the decoding.2 DNA is the substance found in the chromosomes（染色体）of a cell. A chromosome is a chain of genes.Each gene carries a piece of genetic information.At any one moment in a cell, thousands of genes are turned on and off to produce proteins（蛋白质）.The challenge for scientists is to find out what role each gene plays in protein production.At some point this decoding will be complete.Then scientists will have a map of an ideal genome,or a picture of the total genetic nature of a human being.The ideal genome is called a consensus（交感）genome. Everything works well in a consensus genome.3 But no one in the world has a consensus genome.Everyone's genome is different from the ideal. These differences are referred to as genetic mutations（突变）.Genetic mutations in a person's genome mean that the person has a greater than average chance of suffering from health problems.Some problems are not life-threatening.These would include things like colorblindness,or mild headaches.Other problems are serious,such as heart disease,or cancer.4 It will take years to identify the role of each of the 100,000 genes.The short-term goal of the project is to find the physical and mental health problems a person is likely to encounter during his or her lifetime.The long-term goal is to have each person live a longer,healthier life.Scientists are trying hard to discover_________of each of the genes in our body.A:that person's healthB:a scientific answerC:scientific researchersD:the genesE:the functionF:the size
染色体和DNA的关系是（）。①DNA位于染色体上②染色体就是DNA③DNA是染色体的主要成分④染色体和DNA都是遗传物质⑤每条染色体上含有一个或两个DNA分子A、①③⑤B、①②③C、②③④D、③④⑤
下列有关DNA的叙述中，正确的是（）。 ①DNA就是染色体 ②一个DNA分子中含一条染色体 ③DNA与蛋白质构成染色体 ④DNA分子呈双螺旋结构 ⑤染色体成对存在，基因也是成对存在A、①②⑤B、②③⑤C、③④⑤D、①④⑤
DNA多态是指（）。A、染色体DNA中非编码区的差异变化，可引起mRNA的剪切加工异常B、染色体DNA中非编码区碱基的替代，属中性突变C、染色体DNA中编码区碱基的替代，但不引起表型改变D、染色体DNA构象的改变E、染色体DNA的酶切位点的突变
单选题In lines 12－25 of Passage 1, the author states that chromosomes 11 and 16 ______.Aare found in nearly all mammals, birds, reptiles, and fishBcontain a considerable number of dysfunctional genesCserve primarily to create globins, protein chains that compose hemoglobinDprove that the evolutionary process is efficient and complexEare genetic mutations that no longer serve a useful purpose
单选题染色体和DNA的关系是（）。①DNA位于染色体上②染色体就是DNA③DNA是染色体的主要成分④染色体和DNA都是遗传物质⑤每条染色体上含有一个或两个DNA分子A①③⑤B①②③C②③④D③④⑤
单选题下列有关DNA的叙述中，正确的是（）。 ①DNA就是染色体 ②一个DNA分子中含一条染色体 ③DNA与蛋白质构成染色体 ④DNA分子呈双螺旋结构 ⑤染色体成对存在，基因也是成对存在A①②⑤B②③⑤C③④⑤D①④⑤
单选题DNA多态是指（）。A染色体DNA中非编码区的差异变化，可引起mRNA的剪切加工异常B染色体DNA中非编码区碱基的替代，属中性突变C染色体DNA中编码区碱基的替代，但不引起表型改变D染色体DNA构象的改变E染色体DNA的酶切位点的突变
判断题线性DNA片段被导人哺乳动物细胞后，在细胞内酶的作用下，很快相互连接成重复的DNA大片段，并能在随机位点整合到染色体中。A对B错