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The DNA test found the murder was a 14-year-old boy.
A．正确
B．错误
答案
更多“The DNA test found the murder was a 14-year-old boy.A．正确B．错误”相关的问题
第1题
In 2000, a DNA test found the murder immediately.
A．正确
B．错误
第2题
DNA Fingerprinting
DNA is the genetic material found within the cell nuclei of all livingthings. In mammals(哺乳动物)the strands of DNA are grouped into structures called chromosomes(染色体). With the exceptionof identical twins, the complete DNA of each individual is unique.
DNA fingerprinting is sometimes called DNAtyping. It is a method of identification that compares bits of DNA. A DNAfingerprint is constructed by first drawing out a DNA sample from body tissueor fluid such as hair, blood, or saliva(唾液). The sample is then segmented using enzymesc酶) , and the segmentsare arranged by size. The segments are marked with probes and exposed on X-rayfilm,where they form. a pattern of black bars-the DNA fingerprint. If the DNAfingerprints produced from two different samples match, the two samplesprobably came from the same person.
DNA fingerprinting was firstdeveloped as an identification technique in 1985. Originally used to detect thepresence of genetic diseases, it soon came to be used in criminalinvestigations and legal af-fairs. The first criminal conviction based on DNAevidence in theUnited Statesoccurred in 1988. In criminalinvestigations, DNA fingerprints derived from evidence collected at the crimescene are com-pared to the DNA fingerprints of suspects. Generally, courts haveaccepted the reliability of DNA tes-ting and admitted DNA test results intoevidence. However, DNA fingerprinting is controversial in a number of areas:the accuracy of the results, the cost of testing, and the possible misuse of thetech-nique.
The accuracy of DNAfingerprinting has been challenged for several reasons. First, because DNAsegments rather than complete DNA strands are "fingerprinted"; a DNAfingerprint may not be unique; large-scale research to confirm the uniquenessof DNA fingerprinting test results has not been conducted. In addition, DNAfingerprinting is often done in private Iaboratories that may not followuniform. testing standards and quality controls. Also, since human beings mustinterpret the test, human error could lead to false results.
DNA fingerprinting isexpensive. Suspects who are unable to provide their own DNA to experts may notbe able to successfully defend themselves against charges based on DNAevidence.
Widespread use of DNA testingfor identification purposes may lead to the establishment of a DNA fingerprintdatabase.
If two sisters are identical twins, their complete DNAs are
A.the same
B.unique
C.different
D.similar
第3题
DNA Fingerprinting
？？ DNA isthe genetic material found within the cell nuclei of all living things. Inmammals the strands of DNA are grouped into structures called chromosomes. Withthe exception of identical sib- lings (as in identical twins) , the completeDNA of each individual is unique.
？？DNAfingerprinting is somet？？imes called DNA typing. It is a method of identificationthat compares bits of DNA. A DNA fingerprint is constructed by first drawingout a DNA sample from body tissue or fluid such as hair, blood, or saliva. Thesample 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 forma pattern of black bars-the DNA fingerprint. If the DNA fingerprints producedfrom two differ- ent samples match, the two samples probably came from the sameperson.？？
？？DNAfingerprinting was first developed as all identification technique in 1985.Originally used to detect the presence of genetic diseases, it soon came to beused in criminal investigations and legal af- fairs. The first criminal convictionbased on DNA evidence in the United States occurred in 1988. In criminalinvestigations, DNA fingerprints derived from evidence collected at the crimescene are com- pared to the DNA fingerprints of suspects. Generally, courtshave accepted the reliability of DNA tes- ting and admitted DNA test resultsinto evidence. However, DNA fingerprinting is controversial in a number ofareas:the accuracy of the results, the cost of testing, and the possible misuseof the tech-nique.
？？ Theaccuracy of DNA fingerprinting has been challenged for several reasons. First？？,because DNA seg-ments rather than complete DNA strands are"fingerprinted": a DNA fingerprint may not be unique; large-scaleresearch to confirm the uniqueness of DNA fingerprinting test results has notbeen conducted. In addi-tion, DNA fingerprinting is often done in privatelaboratories that may not follow uniform. testing standards and qualitycontrols. Also, since human beings must interpret the test, human error couldlead to false re-sults.
？？ DNA fingerprinting is expen？？sive. Suspectswho are unable to provide their own DNA to experts may not be able tosuccessfully defend themselves against charges based on DNA evidence.
？？ Widespread use of DNA testing for identification purposes may lead tothe establishment of a DNA fingerprint database？？.？？
？？ According to the essay, we can findchromosomes ________？？
A.in a fish
B.in a tree
C.in a sheep
D.in a rock
第4题
根据以下材料，回答题
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 DAN fingerprint is constructed by first drawing out a DNA sample front 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 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 confirn 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 __________. 查看材料
A.the same
B.unique
C.different
D.similar
第5题
A．Don't be nervous.
B．Pull an all-nighter？
C．Want to go bowling tonight？
D．You look really out of it.
第6题
We can infer from the last two paragraphs that
A．dinosaurs" DNA was not replicated in the fiction world of "Jurassic Park".
B．DNA disappears in about 1,000 years and can"t be found in fossils.
C．iron nanoparticles can help the DNA to last longer than 521 years.
D．iron might play a critical role in keeping DNA in the animal fossils.
第7题
We may infer from the second paragraph that
[A] DNA technology has been widely applied to history research.
[B] in its early days the U.S. was confronted with delicate situations.
[C] historians deliberately made up some stories of Jefferson’s life.
[D] political compromises are easily found throughout the U.S. history.
第8题
听力原文： A university professor recently made several experiments with different animals to find out which was the most intelligent. He found out that monkey was more intelligent than other animals.
In one experiment the professor put a monkey in a room where there were several small boxes. Some boxes were inside other boxes. One small box had some food inside of it. The professor wanted to watch the monkey and to find out how long it would take the monkey to find the food. The professor left the room. He waited a few minutes outside the door. Then he knelt down and put his eye to the keyhole. What did he see？ To his surprise he found himself looking directly into the eye of the monkey. The monkey was looking at the professor through the keyhole on the other side of the door.
(23)
A．To find out how clever monkeys were.
B．To test the intelligence of different animals.
C．To tell the difference between man and the monkey.
D．To find out how monkeys search for food.
第9题
A.Right
B.Wrong
C.Not mentioned
第10题
Many a young persons tells me he wants to be a writer. 【M1】______
I always encourage such people, but I also explain that
there's a big differences between "being a writer" and writing. 【M2】______
In cases these individuals are dreaming of wealth and 【M3】______
fame, not the long hours alone on a typewriter. 【M4】______
Reality is that writing is a lonely, private and poor-paying 【M5】______
affair. For every writer kissed by fortune there are thousands
more whose longing is never awarded. When I left a 20 - year career 【M6】______
in the U. S. Coast Guard to become a freelance writer(自由撰稿人) ,
I had no prospects at all. What I did have was a friend who found
me my room in a New York apartment building. It wasn't even 【M7】______
matter that it was cold and had no bathroom. I immediately bought
a used mannual typewriter and felt like a genuine writer. 【M8】______
After a year or so, however, I still hadn't gotten a break and
began to doubt myself. It was so hard to sell a story that barely
made enough to eat. But I knew I wanted to write. 1 had dreamed
about it for years. I wasn't going to be one of those people who
die wondered, What if？ I would keep putting my dream to the test— 【M9】______
even enough it meant living with uncertainty and fear of failure. 【M10】______
This is the Shadow land of hope, and anyone with a dream must
learn to live there.
【M1】
