首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、DNA can solve all the mysteries in biology. B、The DNA of two groups of green turtles are totally different. C、The useless of D
A、DNA can solve all the mysteries in biology. B、The DNA of two groups of green turtles are totally different. C、The useless of D
admin
2019-09-13
59
问题
I’ve mentioned how DNA has solved many mysteries in biology. And today I want to talk about how it might relate to hypothesis about the travels of the green turtle. [23] Every winter some green turtles make a 2,000 km journey from Brazil to Ascension Island in the middle of Atlantic, where they mate and lay eggs. But the question is why do they travel so far to lay their eggs? One researcher hypothesized that there are two parts to the explanation. One is natal homing, [24] the instinct that drives green turtles to always return to the beach where they were hatched. The second part has to do with continental drift, the theory that the positions of earth continents have changed considerably overtime. Brazil and Ascension Island were once much closer together, and continental drift drove them apart. But the turtles kept on going back to the island where they hatched. However another scientist questioned this explanation on the grounds that it would be very unlikely that conditions would allow generations of turtles over hundreds of millions of years to keep going back to the same nesting ground every single year. So, what is the connection to DNA? Well, there are groups of green turtles that nest in locations other than the Ascension Island. If green turtles always return to the place where they were hatched, then the turtles that have been going to the Ascension Island to nest would have been genetically isolated long enough to have DNA that was very different from the green turtles that nest elsewhere. But when scientists examined DNA from these turtles, their DNA wasn’t that different from the DNA of the turtles that go to Ascension Island. Do you have a shock? Well, we still don’t know the answer to the question about why a certain group of turtles go to Ascension Island, but [25] this study was a nice example of the usefulness of DNA analysis to biology.
1.How far do some green turtles travel to lay their eggs?
2.What drives green turtles to return to the beach according to the theory of “natal homing”?
3.What is proved in this study?
选项
A、DNA can solve all the mysteries in biology.
B、The DNA of two groups of green turtles are totally different.
C、The useless of DNA analysis to biology.
D、The usefulness of DNA analysis to biology.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/yXW7777K
0
大学英语六级
相关试题推荐
5WeekstoaStress-FreeLife[A]Whowillyoubethisyear?Willyoubeabetter,wiserversionofyourselfbythetimethecal
SecretE-Scores[A]Americansareobsessedwiththeirscores.Creditscores,G.P.A.’s,SAT’s,bloodpressureandcholesterol(胆固
America’smostpopularnewspaperwebsitetodayannouncedthattheeraoffreeonlinejournalismisdrawingtoaclose.TheNewY
Itisnogooddwellingonthepast.Whatexistedorhappenedinthepastmayhavebeenbeautifulorexcitingandmaynowbringp
Webuybooks,andthentheywaitforustoreadthem.Days,months,evenyears.Booksare【C1】______That’sOKforbooks,butnot
Forthispart,youareallowed30minutestowriteanessayonclassicreading.Youressayshouldfocusonthereasonsforfewp
A、Showtheadd/dropformtoProfessorSmith.B、GoonattendingProfessorSmith’sclass.C、Cometotheregistrationofficewitht
A、Heshouldnolongerputoffanythinginlife.B、Heshouldcelebratehissurvivalwithhisfriends.C、Heshouldeliminatenegat
A、Tovisittheprofessorprivately.B、Toarguewiththeprofessor.C、Toattendtheprofessor’sclass.D、Toskiptheprofessor’s
A、Climate.B、Instinct.C、Temperature.D、Salinity.B
随机试题
Accordingtothedictionarydefinitionof"create”,ordinarypeoplearecreativeeveryday.Tocreatemeans"tobringintobeing
适应性障碍是人群中常见的一种心理障碍,一般是因环境改变、职务变迁或生活中某些不愉快的事件,加上患者的不良个性,而出现的一些情绪反应及生理功能障碍,并导致学习、工作、生活及交际能力的减退。根据上述定义,下列属于适应性障碍的是:
气相色谱分析定量方法有()。
《中华人民共和国环境影响评价法》规定:接受委托为建设项目环境影响评价提供技术服务的机构,应当经国务院环境保护行政主管部门()合格后,颁发资质证书,按照资质证书规定的(),从事环境影响评价服务,并对评价结论负责。
初步设计的任务是( )。
甲企业于2011年1月1日从乙银行借款1000万元。期限为1年零9个月,但双方在借款合同中没有约定支付利息的期限,在依照《合同法》有关规定仍不能确定的情况下,甲企业支付利息的期限为()。
郑伯克段于鄢初,郑武公娶于申,曰武姜。生庄公及共叔段。庄公寤生,惊姜氏,故名曰寤生,遂恶之。爱共叔段,欲立之。亟请于武公,公弗许。及庄公即位,为之请制。公曰:“制,岩邑也;虢叔死焉,它邑唯命。”请京,使居之,谓之京城大叔。祭仲曰:“都城
甲乙两个建筑队原有水泥的重量比是4:3,当甲队给乙队54吨水泥后,甲乙两队水泥的重量比是3:4,问原来甲队有多少吨水泥?
Isdentistrythecareerforyou?Today’sdentistshavemanymoreopportunitiesthantheyusedto.Inthepast,adentist’slife
Weregret(tell)______youthatthematerialsyouorderedwereoutofstock.
最新回复
(
0
)