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 new type of organism discovered in an Arctic tunnel came to life in the lab after being frozen for 32,000 years. The deep-free
A new type of organism discovered in an Arctic tunnel came to life in the lab after being frozen for 32,000 years. The deep-free
admin
2014-05-14
29
问题
A new type of organism discovered in an Arctic tunnel came to life in the lab after being frozen for 32,000 years. The deep-freeze bacteria could point to new methods of cryogenics, and they are the sort of biology scientists say might exist on Mars and other planets and moons. "The existence of microorganisms in these harsh environments suggests——but does not promise——that we might one day discover similar life forms in the glaciers or permafrost of Mars or in the ice crust and oceans of Jupiter’s moon Europa," said Richard Hoover, an astrobiologist at NASA’s Marshall Space Flight Center. Other microbes have been discovered in similar frigid environments, sometimes clinging to pockets of liquid water in ice packs. And some microbes survive in ice as spores, but they need to be cultured to bring them to life.
The announcement of the discovery Wednesday comes just a day after a team of European re- searchers said they found blocks of ice just under the surface of Mars near the equator. The Europeans said the ice, between 2 million and 5 million years old, could serve as storehouses for life. The new bacterium thrives under a microscope despite having been thawed from ice dating back some 32,000 years, to the Pleistocene era. Living bacteria are stained green.
Hoover said the creatures he has found might be able to survive in their suspended state for millions of years. The discovery opens up a whole new possibility that a future mission to Mars might be able to retrieve any life that’s there. "Ice samples from this [Martian ice] sea could con-rain cryopreserved microorganisms if life ever flourished on the surface of Mars," Hoover said in a telephone interview. He is particularly excited about the instant revival qualities of the creatures found in Alaska. "You might actually get them growing in pure culture," he said of the potential Martian cousins. It would be a "wonderful way of retrieving intact, viable Martian organisms, if they are there."
Water does not guarantee life, but it is a crucial ingredient. Hoover said the Martian ice blocks are so near the surface that they might partly melt in summer, creating underground pools of water that would allow any microorganisms to grow and reproduce. (Life above ground is considered unlikely due to Mars’ dry surface conditions and intense radiation. )
What does the discovery of deep-freeze bacteria mean to us, according to the passage?
选项
A、We might one day find form of life on other planets.
B、Scientists from NASA made a great progress in discovering the microorganisms
C、To retrieve any life that has died long ago is impossible.
D、Alaska is a place abundant in microorganisms.
答案
A
解析
推理题。文章第一段提到“The existence of microorganisms in these harsh environments suggests-but does not promise——that we might one day discover similar life forms in the glaciers or permafrost of Mars or in the ice crust and oceans of Jupiter’s moon Europa,”(这些微生物在
转载请注明原文地址:https://kaotiyun.com/show/8ZUK777K
0
专业英语四级
相关试题推荐
Thechancesofarepetitionoftheseunfortunateeventsare______indeed.
Theschemewas______whenitwasdiscovereditwouldbeverycostly.
Evenifyouaresayinganddoingtherightthingsatyourjob,andinyourpersonallife,youcouldbemakingabad(1)_____one
Americaisoneofmanycountrieswherethestategivesaleg-uptomembersofcertainracial,ethnic,orothergroups(1)_____ho
IntheUnitedStates,thefirstdaynursery,wasopenedin1854.Nurserieswereestablishedinvariousareasduringthe(1)_____
WriteonANSWERSHEETTWOanoteofabout50-60wordsbasedonthefollowingsituation:YouareDavid/Rachel.Youhavejusth
Shynessisapsychologicalstatethatcausesapersontofeeldiscomfortinsocialsituationsinwaysthatinterferewithenjoym
______thereislittlewecandotochangethereality,wecannotbetotallyatthemercyoftheharshenvironment.
TheHousingCommitteehasdecidedtogive______totheyoungmarriedcouplewithonlyonechild.
Theyknowundergroundlendingisvery______becauseofthehighinterestrates,buttheyhavenochoice.
随机试题
竞选委托可以采取()的形式。
工程竣工验收报告经发包人认可后28天内,承包人未能向发包人递交竣工结算报告等资料,造成工程竣工结算不能正常进行或工程竣工结算价款不能及时支付的,则()。
下列不属于地面土建工程的是()。
2014年3月8日,多成公司在证券交易所以存出投资款2400000元购入甲公司股票30万股(每股面值1元)作为交易性金融资产,另支付手续费50000元。2014年4月22日,甲公司宣告发方2013年度现金股利每股0.1元,多成公司于2014年5月15
甲股份有限公司(以下简称甲公司)为了建造一栋厂房,于2001年11月1专门从某银行借入5000万元(假定甲公司向该银行的借款仅此一笔),借款期限为2年,年利率为6%,利息到期一次支付。该厂房采用出包方式建造,与承包方签订的工程合同的总造价为8000万
推进农村改革发展需遵循的重大原则有()。
我国经济体制改革的目标是()。
近代中国派遣第一批留学生是在()。
在当代中国,坚持发展是硬道理的本质要求就是
Scientificevidencefromdifferentdisciplinesdemonstratesthatinmosthumansthelefthemisphereofthebraincontrolslangua
最新回复
(
0
)