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
考研
The discovery last week of possible evidence of life on Mars has electrified debate over whether the universe is a barren void o
The discovery last week of possible evidence of life on Mars has electrified debate over whether the universe is a barren void o
admin
2009-04-27
55
问题
The discovery last week of possible evidence of life on Mars has electrified debate over whether the universe is a barren void or a nursery pregnant with life.
Scientists who have come stunningly close to repeating genesis, or the origin of life, in a test tube, say the building blocks for life exist everywhere. The challenge is putting them together. (46)
"The origin of life is a relatively easy concept and there’s a wide variety of conditions under which it will take place," said late Stanley Miller, a professor at the University of California and a pioneer in the field.
"Perhaps the remarkable thing is that even though Mars is not a favorable environment, the origin of life took place."
Astronomers have found that the same gases present in our solar system are present throughout the universe.
(47)
Efforts to make microscopic life from these basic elements on Earth suggests the chance of life arising under similar circumstances is the same everywhere, say chemists, biologists and other experts.
"It seems fairly likely that life similar to ours, if there is water available ’" would evolve in other environments in our galaxy or our universe," said James Ferris, a leading researcher and editor of the journal "Origins of Life and Evolution of the Biosphere."
Underlying much of the research is the question. Was the development of life on Earth unique, or did the universe’s chemical elements naturally evolve into life? (48)
The answer appears to be that at least the chemical reactions that set the stage for early life would be similar everywhere, but resultant living organisms would differ because of the genetic mutations in evolution.
"If you’ve got the same starting materials and the same conditions, you’re going to get the a me compounds, that’s for sure," Miller said. "The real question is whether or not there are chance elements in the formation of life."
(49)
In a 1953 experiment, Miller mixed basic gases approximating the Earth’s early atmosphere with an electric charge inside a glass chamber and produced amino acids, a primitive building block of life.
He then suggested that life was a natural evolution. It seemed that science was on the verge of conjuring up creations in the laboratory, but the next 43 years were to present unexpected challenges.
(50)
"Making the amino acids made it seem like the rest of the steps would be very easy; it’s turned out to be more difficult than I thought it would be," Miller said in an interview.
选项
答案
答案似乎是:为早期生命创造条件的化学反应至少在每处都是相似的。但是由于在进化过程中基因发生了突变,因此随之而产生的生命有机体是不一样的。
解析
注意本句的主干结构为以but的复合句。其中分别包含一个以appear to be that引导的宾语从句和以because of引导的原因状语。
转载请注明原文地址:https://kaotiyun.com/show/KMa4777K
0
考研英语一
相关试题推荐
TheSevenWondersoftheAncientWorldwereacollectionofremarkableconstructionslistedbyvariousGreekauthors,including
Americanschoolsaren’texactlyfrozenintime,butconsideringthepaceofchangeinotherareasoflife,ourpublicschoolste
Whiletherearerivalcontenders,thetitleoftheworld’sfirstdepartmentstorebelongs,perhaps,toHarding,Howell&Co’sGr
RunningfortheofficeofthePresidentoftheUnitedStatesisexceptionallyarduousandshouldnotbeundertakenbythe【C1】___
Studentsofmanagementtheoryhavelong【C1】______whatconstitutestheworstkindofbook—theCEOautobiographyorthemanagement
StateandlocalauthoritiesfromNewHampshiretoSanFranciscohavebegunbanningtheuseoffacial-recognitiontechnology.The
StateandlocalauthoritiesfromNewHampshiretoSanFranciscohavebegunbanningtheuseoffacial-recognitiontechnology.The
Doctorsalreadyknowthatpeoplewhosmokecandamagetheirhearing.ThelateststudyinthejournalTobaccoControl,【C1】_______
Doctorsalreadyknowthatpeoplewhosmokecandamagetheirhearing.ThelateststudyinthejournalTobaccoControl,【C1】_______
WhataccountsforthegreatoutburstofmajorinventionsinearlyAmerica—breakthroughssuchasthetelegraph,thesteamboatand
随机试题
设a=i+2j+3k,b=3i+6j-μk,且a∥b,则μ=_______.
Whatis【21】thatateachermostwantsinhisstudents?Attentiveness?Agoodmemory?Diligence?Certainlythesearethequalitie
24岁已婚妇女,阴道分泌物多,伴外阴瘙痒1周。妇科检查见阴道后穹隆处有多量稀薄泡沫状分泌物,阴道黏膜有多处散在红色斑点,宫颈光滑。临床诊断考虑为
关于热原的错误表述是
从资金来源划分,期货市场的机构投资者可分为()。
现金流量表把企业活动分为()
现在有一些领导干部被称为“三五干部”,即打麻将三五夜不睡,喝酒三五场不醉。游山玩水三五月不累。对此,你有什么看法?
人质
Ifyoudevelopareputationforbeingabletokeepsecrets,otherswill______towardsyouwithusefulnewsandgossip.
BydrawingontheWorldBank’sprojectionsofsocioeconomicdevelopmentoverthenextquartercentury,researchersattheWorl
最新回复
(
0
)