题目内容
（请给出正确答案）
According to the fifth paragraph, which of the following about bees' genes is true？
A．Bees' genes allow them to expand their colonies.
B．Bees' genes help keep them in their hives.
C．Bees' genes make them fly from flower to flower.
D．Bees' genes could explain the collapse of some colonies.
安装简答题APP，拍照搜题省时又省心！
更多“According to the fifth paragra…”相关的问题
A、He never showed any panic.
B、He hoped his son would come back to get him.
C、Though old, he was sharp in all senses of life.
D、He questioned the fairness of the law of nature.
A.competitive
B.diligent
C.qualified
D.equal
A.Right
B.Wrong
C.Not mentioned
？？ Molecular biologist Dean Hamer has blue eyes, light brown hair and agood sense of humor. He smokes cigarettes, spends long hours in an old laboratoryat the US National Institute of Health, and in his free time climbs up cliffsand points his skis down steep slopes. He also happens to be openly, matter offactly gay.
？？ What isit that makes Hamer who he is？ What, for that matter, accounts for the talentsand traits that make up anyone's personality？ Hamer is not content merely toask such questions; he is trying to answer them as ？？well.？？ A pioneer in the fieldof molecular psychology, Hamer is exploring the role genes play in governingthe very core of our individuality. To a remarkable extent, his work on whatmight be called the gay, thrill-seeking and quit-smoking genes reflects how owngenetic predispositions.
？？ Thatwork, which has appeared mostly in scientific journals, has be？？en gathered intoan accessible and quite readable form. in Hamer's creative new book, Living withOur Genes. "You have about as much choice in some aspect of yourpersonality. " Hamer and co-author Peter Copeland write in the in-troductory chapter, "as you do in the shape of your nose or the size ofyour feet. "
？？ Untilrecently, research into behavioral genetics was dominated by psychia？？trists andpsycholo- gists, who based their most compelling conclusions about theimportance of genes on studies of identi- cal twins. For example, ps？？ychologistMichael Bailey of Northwestern University famously demonstra- ted that if oneidentical twin is gay, there is about a50% likelihood that the other will betoo. Seven years ago. Hamer picked up where the twin studies left off, homingin on specific strips of DNA that appear to influence everything from mood tosexual orientatiom
？？ Hamerswitched to behavioral genetics from basic research, after rec？？eiving hisdoctorate from Harvard, he spent more than a decade studying the biochemistryof a protein that cells use to metabo- lize heavy metals like copper and zinc.As he was about to turn 40, however, Hamer suddenly realized he had learned asmuch about the protein as he cared to. "Frankly, I was bored, " heremembers, "and ready for something new. "？？
？？ Homosexual behavior,in particular, seemed ripe for exploration becausefew scientists had dared tackle such an emotionally and politically chargedsubject. "I'm gay, " Hamer says with a shrug, "but that was not a major motivation. Itwas more of a question of intellectual curiosity-and the fact that no one elsewas doing this sort of research. "
？？The first paragraph describes Hamer's ？？？？
A.looks, hobbies and character
B.viewpoint on homosexuality
C.unique life-style
D.scientific research work
？？ 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
A.thought
B.account
C.mind
D.brain
为了保护您的账号安全，请在“简答题”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
微信搜一搜
简答题
微信搜一搜
简答题
如搜索结果不匹配，请 
