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关于线粒体的起源有多种观点,其中“内共生起源”学说认为真核细胞中的线粒体是由侵入细胞或被细胞吞入的某种原核细胞经过漫长的岁月演变而来的.请结合所学知识和图1作答. (1)图1中乙所示的过程体现了...
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高三下学期生物《》真题及答案
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内共生学说是关于线粒体起源的一种学说该学说认为线粒体是细菌原线粒体被真核生物吞噬后长期的共生过程中原
线粒体是具有双层膜结构的细胞器
线粒体内膜和外膜蛋白质种类差异不大
线粒体能够控制部分蛋白质合成
线粒体内含有少量的DNA和RNA
简述线粒体与叶绿体的内共生起源学说和非共生起源学说的主要论点及其实验论据
内共生起源学说
内共生起源理论主要是对起源的解释
细胞核
线粒体
高尔基体
叶绿体
简述内共生起源学说
下面有关基因组的说法正确的是
叶绿体基因组大小相对恒定
叶绿体基因组同蓝藻基因组大小相似,这提示叶绿体内共生起源
目前己发现一些线粒体的基因组由双链RNA构成
目前已有多种真核生物的全基因序列被基本测定
4下面有关基因组的说法正确的是
叶绿体基因组大小相对恒定
叶绿体基因组同蓝藻基因组大小相似,这提示叶绿体内共生起源
目前己发现一些线粒体的基因组由双链RNA构成
目前已有多种真核生物的全基因序列被基本测定
线粒体和叶绿体的内共生起源学说指出线粒体叶绿体分别起源于一种原始的好氧细菌和蓝藻类原核细胞它们最早被
下面哪项不是叶绿体内共生起源学说的证据
叶绿体靠裂殖方式分裂
叶绿体DNA大小在100kb-200kb之间
有的叶绿体含有藻胆体
有的原核光合生物含有叶绿素b
真核生物的内共生起源假说认为大约在15亿年以前一些大型的具有吞噬能力的原始真核细胞先后吞并了几种原核
真核生物的内共生起源假说认为大约在15亿年以前一些大型的具有吞噬能力的原始真核细胞先后吞并了几种原核
如图所示内共生起源学说认为线粒体叶绿体分别起源于一种原始的好氧细菌和蓝藻类原核细胞它们最早被原始的
线粒体和叶绿体中有核糖体,不支持内共生学说
线粒体和叶绿体分裂繁殖的事实不支持内共生学说
据此学说,线粒体外膜是从原始的真核细胞的细胞膜衍生而来
先祖厌氧真核生物吞噬需氧菌后使其解体,解体后的物质组装成线粒体
关于叶绿体和线粒体起源有哪几种学说内共生学说的内容和依据是什么
内共生起源说
真核生物的内共生起源假说认为大约在15亿年以前一些大型的具有吞噬能力的原始真核细胞先后吞并了几种原核
对玉米叶绿体rRNA的研究发现,与细菌的相似而与细胞质不同
叶绿体中许多代谢途径与蓝藻相似而与细胞质不同
线粒体在真核细胞中普遍存在
线粒体和叶绿体都含有DNA,能自我复制
关于线粒体的起源有一种说法是内共生假说即线粒体来源于被原始的前真核生物吞噬的好氧性细菌这种细菌和前真
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真核生物的内共生起源假说认为大约在15亿年以前一些大型的具有吞噬能力的原始真核细胞先后吞并了几种原核
根据内共生起源学说线粒体和叶绿体分别起源于①原细菌②原始真核细胞内细菌状共生体③紫色硫细菌④反硝化细
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②⑤
关于线粒体的起源有多种观点其中内共生起源学说被普遍接受如图所示下列事实中不支持线粒体内共生起源学说的
线粒体内含有DNA和RNA,在遗传上具有半自主性
线粒体在细胞内可以运动,并大量集中在代谢旺盛部位
线粒体的外膜成分与细胞的其他内膜系统相似,内膜与细菌细胞膜相似
吞噬现象普遍存在,如白细胞吞噬病菌
根据内共生起源学说线粒体和叶绿体分别起源于①原细菌②原始真核细胞内细菌状共生体③紫色硫细菌④反硝化细
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②④
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IfItheproblembythistimetomorrowIwillletyouknow. A.haveworked B.work C.hadworked D.willwork
如图所示光滑水平轨道MN与半径为R的竖直光滑圆弧轨道相切于N点质量为m的小球B静止于P点小球半径远小于R.与B相同的小球A以速度v0向右运动同小球B发生弹性碰撞.求当v0在什么范围内小球B在圆弧轨道内运动时不会脱离轨道已知重力加速度为g.
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亚铁__{K4[FeCN6]}俗称黄血盐常用于检验Fe3+也是食盐防结剂.以生产电石的副产物氰熔体[CaCN2和NaCN的混合物]为原料制备亚铁__的流程如图1 回答下列问题 1“浸取”需控制在80C以下进行原因是. 2用硫酸亚铁晶体配制FeSO4溶液时还需加入. 3对“滤液”处理可获得一种实验室常用干燥剂它的化学式是. 4“加热”使HCN气体逸出发生“反应Ⅲ”生成亚铁__二氧化碳和氢气该反应化学方程式为. 5“反应Ⅲ”后的溶液经蒸发浓缩冷却结晶干燥即得产品. 6工业上以石墨为电极电解亚铁__溶液可以制备铁__{K3[FeCN6]可用于检验Fe2+}阳极的电极反应式为. 7设计如图象实验探究牺牲阳极的阴极保护法原理. 得出结论①锌能保护铁 ②.
NA代表阿伏加德罗常数的值.下列说法正确的是
如图所示质量为3m的重物与一质量为m的线框用一根绝缘细线连接起来挂在两个高度相同的定滑轮上已知线框的横边边长为L水平方向匀强磁场的磁感应强度为B磁场上下边界的距离线框竖直边长均为h.初始时刻磁场的下边缘和线框上边缘的高度差为2h将重物从静止开始释放线框上边缘刚进磁场时恰好做匀速直线运动滑轮质量摩擦阻力均不计.则下列说法中正确的是
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降冰片二烯类化合物是一类太阳能储能材料.降冰片二烯在紫外线照射下可以发生下列转化.下列说法错误的是
Tolearntothinkistolearntoquestion.Thosewhodon'tquestionnevertrulythinkforthemselves.Thesearesimplerolesthathavegovernedtheadvancementofscienceandhumanthoughtsincethebeginningoftime.Advancementsaremadewhenthinkersquestiontheoriesandintroducenewones.Unfortunatelyitisoftenthegreatandrespectedthinkerswhoendupslowingtheprogressofhumanthought.Aristotlewasabrilliantphilosopherwhosetheoriesexplainedmuchofthenaturalworldoftenincorrectly.Hewassoesteemedbythescientificcommunitythateven1200yearsafterhisdeathscientistswerestilltryingtobuilduponhismistakesratherthancorrectthem! Brilliantmindscanintimidateup﹣and﹣comingthinkerswhoarenotconfidentoftheirabilities.TheyoftenbelievetheyareinferiortothemindsofgiantssuchasAristotleleadingmanytoacceptcurrentparadigmsinsteadofquestioningthem. Ilikemanythinkersofthepastoncebelievedinmymentalinferiority.Iwascertainthatmyparentsmyteachers﹣adultsingeneral﹣werealwaysright.TheywerelikeatextbooktomeIdidn'tquestionwhatwaswrittenonthosepages.Irespectedthemandacceptedwhatevertheytoldme.Butthatattitudesoonchanged.Mymind'sindependencewasfirststimulatedintheclassroom. Astern65﹣year﹣oldelementary﹣schoolscienceteacheroncetoldmethatlightisatypeofwave.Iconfidentlywentthroughyearsofschoolbelievingthatlightisawave.OnedayhoweverIheardtheGermanexchangestudentmentionthatlightcouldbemadeupofparticles.AstheotherslaughedathisstatementIstartedtoquestionmybeliefs. Maybetheteachersandtextbookshadn'tgivenmethewholestory.Iwenttothelibrarydidsomeresearchandlearnedofthelight﹣as﹣a﹣waveversuslight﹣as﹣a﹣particledebate.IreadaboutEinstein'sdiscoveryofthedualnatureoflightandlearnedthefactsofaparadox悖论thatpuzzlestheworld'sgreatestthinkerstothisday.Lightbehavesasbothaparticleandawaveitisbothatonce.IrealizedIhadgonethroughlifeacceptingonlyhalfofthestoryasthewholetroth. EachnewyearbroughtmorenewfactsandIformulatedevenmorequestions.IfoundmyselfinthelibraryafterschooltryingtofindmyownanswerstogainamorecompleteunderstandingofwhatIthoughtIalreadyknew.Idiscoveredthatmyparentsandteachersareincredibletoolsinmyquestforknowledgebuttheyareneverthefinalword.Eventextbookscanbechallenged.IlearnedtoquestionmysourcesIlearnedtobeathinker.IoncebelievedthateverythingIlearnedathomeandatschoolwascertainbutIhavenowdiscoveredtore﹣examinewhennecessary. QuestionsaresaidtobethepathtoknowledgeandtrothandIplantocontinuequestioning.Howmanythingsdoweknowforsuretodaythatwewillquestioninthefuture?AtthismomentIknowthatoursunwillbumforanotherfivebillionyearsandIknownothingcanescapethegravityofablackhole.Thisknowledgehowevermaychangeinthenext20years﹣maybeeveninthenexttwo.Theonethingwecancontrolnowisouropennesstodiscovery.Questionsarethetoolsofopenmindsandopenmindsarethekeytointellectualadvancement. 1WhatdoestheexampleofAristotleinthefirstparagraphshow? A.Advancementsaremadewhenthinkersquestiontheories. B.Greatthinkersoftenmakemistakesandthencorrectthem. C.Heisthegreatestandrespectedphilosopherofalltime. D.Hugeinfluenceofgreatthinkersmayblockhumanthought. 2TheunderlinedwordintimidateinParagraph2means. A.encourage B.frighten C.strength D.persuade 3Whydidtheauthorbegantoquestionhispreviousbeliefs? A.Hewasinspiredbythedifferentideasfromanexchangestudent. B.Whathelearnedfromtextbooksbeforeturnedouttobewrong. C.Hewasnotsatisfiedwithhislifeanddesperatetoachievesuccess. D.Hewaslaughedatbyotherstudentsforhisunacceptablestatement. 4Accordingtothepassagetheauthor. A.determinestobeathinkerandquestioner B.alwaysthrowshimselfintothelaboratory C.neverdoubtswhathehaslearnedinthetextbook D.looksdownupongreatthinkersallthetime 5Whatcanweconcludefromthelastparagraph? A.Wehumanbeingsdon'tdaretopredictfuture. B.Theauthorisnotquitesureabouthisfuture. C.Thetheoryofblackholeswillchangeintwoyears. D.Questioningisnecessarytopromoteadvancement. 6Whatdoesthepassagemainlytalkabout? A.Followingroles. B.Questioninggiants. C.Challengingyourself. D.Predictingfuture.
根据如图其他产物未写出分析下列说法正确的是
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竖直面纸面内两固定长直导线L1L2中通有如图所示的电流P点位于L1L2正中间整个空间存在磁感应强度大小为B0方向垂直于纸面向里的匀强磁场未画出此时P点的磁感应强度大小为0.若L1中电流反向则P点的磁感应强度大小为B0方向垂直纸面向里则
化学与生产生活密切相关下列说法不正确的是
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罗马Roman字母表是希腊人的发明马拉松赛跑也是.这项长跑比赛是为了纪念一名希腊战士而创立的.
Somebusinessownersarekeenonpublicwelfare.Thisislocalserviceshavebeenfunded. A.whether B.what C.where D.how
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图甲为一列简谐横波在t=0.10s时刻的波形图P是平衡位置为x=1m处的质点Q是平衡位置为x=4m处的质点图乙为质点Q的振动图象则下列说法正确的是 A.该波的周期是0.10s B.该波的传播速度为40m/s C.该波沿x轴的负方向传播 D.t=0.10s时质点Q的速度方向向下 E.从t=0.10s到t=0.25s质点P通过的路程为30cm
Everydayweexperienceoneofthewondersoftheworldarounduswithoutevenrealizingit.Itisnottheamazingcomplexityoftelevisionnortheimpressivetechnologyoftransport.Theuniversalwonderweshareandexperienceisourabilitytomakenoisewithoutmouthsandsotransmitideasandthoughtstoeachother'sminds.①Thisabilitycomessonaturallythatwetendtoforgetwhatamiracleitis. ②Obviouslytheabilitytotalkissomethingthatmarkshumansofffromanimals.Ofcoursesomeanimalshavepowersjustasamazing.Birdscanflythousandsofmilesbyobservingpositionsofthestarsintheskyinrelationtothetimeofdayandyear.InNature'stalentshowhumansareaspeciesofanimalsthathavedevelopedtheirownspecialact.Ifwereduceittobasictermsit'sanabilityforcommunicatinginformationtoothersbyvaryingsoundswemakeaswebreatheout. ③Notthatwedon'thaveotherpowersofcommunication.Ourfacialexpressionsconveyouremotionssuchasangerorjoyordisappointment.Thewayweholdourheadscanindicatetootherswhetherwearehappyorsad.Thisisso﹣calledbodylanguage.Bristling直立的furisanunmistakablewarningofattackamongmanyanimals.Similarlythebowedheadordroopingtailshowsareadinesstotakesecondplaceinanyanimalgathering. Suchameansofcommunicationisabasicmechanismthatanimalsincludinghumanbeingsinstinctively本能地acquireanddisplay④Ifsohowdidhumanbeingsacquirethisamazingskills?Biologistscanreadilyindicatethatparticularareaofourbrainwherespeechmechanismsfunctionbutthisdoesn'ttellushowthatpartofourbodiesoriginatedinourbiologicalhistory. 1WhichblankisthemostsuitableforIstheabilitytospeakjustanothersortofinstinct? A.① B.② C.③ D.④ 2Accordingtothepassagethewonderwetakeforgrantedis. A.ourabilitytouselanguage B.ourabilitytomakenoiseswithmouth C.theunforgettablemiracleofnature D.theamazingpoweroftechnology 3Whatisthispassagemainlyabout? A.Thedevelopmentofbodylanguage. B.Thepowertoconveyinformationtoothers. C.Thespecialrolehumansplayinnature. D.Thedifferencebetweenhumansandanimals.
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LastnightIwitnessedthefirstofonlyeightperformancesofGiacomoPuccini'sworld﹣famousoperaTurandotintheForbiddenCityinBeijingChina. A.performing B.havingbeenperformed C.beingperformed D.tobeperformed
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