职称英语考试

试题来源：2013年职称英语等级考试真题（卫生类A级）
【单选题】

第二篇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 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.
36. If two sisters are identical twins, their complete DNAs are
A.   the same.
B.   unique.
C.   different.
D.   similar.
37. DNA fingerprinting is a technique of
A.   grouping DNA strands into structures.
B.   segmenting DNA with probes
C.   constructing body tissues by enzymes.
D.   identifying a person by comparing DNAs
38.  DNA fingerprinting was first used in
A.   criminal investigation.
B.   animal reproduction.
C.   private laboratories
D.   genetic disease detection.
39.  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.
40.  it can be inferred from Paragraph 5 that DNA fingerprinting
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.

网考网参考答案：A、D、D、A、B
大数据分析：根据网考网与考试题库的统计分析，该试题：
41%的考友选择了A选项
50%的考友选择了B选项
8%的考友选择了C选项
1%的考友选择了D选项
考友解析与评论：
 · 这个答案靠谱吗？
 · 我也是A、D、D、A、B，是不是标准答案，晕
 · 这个答案有点争议 好像这个考试很多答案都有争议啊