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用体外实验的方法可合成多肽链．已知苯丙氨酸的密码子是UUU，若要在体外合成同位素标记的多肽链，所需的材料组合是（ ） ①同位素标记的tRNA ②蛋白质合成所需的酶 ③同位素标记的苯丙氨酸 ...
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高三下学期生物《》真题及答案
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下列为某多肽链和控制它合成的一段DNA链甲硫氨酸的密码子是AUG甲硫氨酸一脯氡酸一苏氨酸一甘氨酸一缬
这段多肽链中有4个“一CO—HN一”的结构
决定这段多肽链的遗传密码子依次是AUG、CC
ACC.GGG、GUAC.这段DNA中的①链起了转录模板的作用
若发生基因突变，则该多肽链的结构一定发生改变
科学家已经证明密码子是mRNA上决定一个氨基酸的三个相邻的碱基1根据理论推测mRNA上的三个相邻的碱
已知有三种氨基酸的密码子是甲硫氨酸AUG色氨酸UGG苯丙氨酸UUU或UUC某多肽链的一段氨基酸序列—
图表示某DNA片段遗传信息的传递过程①～⑤表示物质或结构abc表示生理过程请据图回答下列问题可能用到
下图表示基因控制蛋白质合成的过程请分析回答1基因是有遗传效应的___________片段2过程Ⅰ称为
科学家已经证明密码子是mRNA上决定一个氨基酸的三个相邻的碱基1根据理论推测mRNA上的三个相邻的碱
下图表示某DNA片段遗传信息的传递过程①～⑤表示物质或结构abc表示生理过程请据图回答下列问题可能用
下列为某多肽链和控制它合成的一段DNA链甲硫氨酸的密码子是AUG甲硫氨酸—脯氨酸—苏氨酸—甘氨酸—缬
这段多肽链中有4个“—CO—HN—”的结构
决定这段多肽链的遗传密码子依次是AUG、CC
ACC.GGG、GUAC.这段DNA中的①链起了转录模板的作用
若发生基因突变，则该多肽链的结构一定发生改变
如图表示某DNA片段遗传信息的传递过程①～⑤表示物质或结构abc表示生理过程请据图回答下列问题可能用
密码子的阅读方向是____多肽链合成的方向是____
mRNA上决定一个氨基酸的三个相邻的碱基叫密码子根据理论推测mRNA上三个相邻的碱基可以构成____
甲硫氨酸的密码子AUG通常被称为起始密码子即翻译过程从该密码子开始能够得出这一结论的事实是
信使RNA最前端的3个碱基通常都是AUG
甲硫氨酸只有一个密码子，其它氨基酸有多个密码子
所有生物中都含有甲硫氨酸的密码子
新合成多肽链的第一个氨基酸通常是甲硫氨酸
用体外实验的方法可合成多肽链．已知苯丙氨酸的密码子是UUU若要在体外合成同位素标记的多肽链所需的材
①②④
②③④
③④⑤
①③⑤
长期以来科学家们对遗传的物质基础进行了大量的研究并得出了一些科学结论第一个被科学家破译的是决定苯丙氨
44.下图表示控制某多肽链合成的一段DNA链已知甲硫氨酸的密码子是AUG合成的多肽链的氨基酸组成为甲
该多肽链中有4个“—CO—HN—”结构
决定该多肽链的遗传密码子依次是AUG、CC
ACC.GGG、GUA C.上图DNA片段中的①链起了转录模板的作用
若发生基因突变，则该多肽链的结构一定发生改变
关于遗传密码正确的是
多数氨基酸都有一种以上的密码子
一种密码子只代表一种氨基酸
鸟氨酸、瓜氨酸和羟脯氨酸都有遗传密码子
起始部位的 AUG同时是起始密码子和蛋氨酸密码子
终止密码子使多肽链合成终止
在大肠杆菌的蛋白质合成系统中合成一条多肽链如下fMet-Arg-His-Ala-Val已知Met的t
下图表示控制某多肽链合成的一段DNA链已知甲硫氨酸的密码子是AUG合成的多肽链的氨基酸组成为甲硫氨酸
该多肽链中有4个“―CO―HN―”结构
决定该多肽链的遗传密码子依次是AUG、CC
ACC.GGG、GUAC.上图DNA片段中的①链起了转录模板的作用
若发生基因突变，则该多肽链的结构一定发生改变
下图表示控制某多肽链合成的一段DNA链已知甲硫氨酸的密码子是AUG合成的多肽链的氨基酸组成为甲硫氨酸
该多肽链中有4个“—CO—HN—”结构
决定该多肽链的遗传密码子依次是AUG、CC
ACC.G.GG、GUAC.上图DNA片段中的①链起了转录模板的作用
若发生基因突变，则该多肽链的结构一定发生改变
请回答下列有关真核细胞中遗传信息及其表达的问题1已知某基因片段碱基排列如下图由它控制合成的多肽中含有
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设z＝1﹣ii是虚数单位若复数在复平面内对应的向量为则向量的模是
30分ThedayIhadbeenafraidofinsixweekshadfinallyarrived﹣﹣﹣TheLeagueFinalsforthe4x400metersrelay.Thethoughtofracingother6thgradersfromdifferentschools1me.ItalsoworriedmethatIwasrunningthirdlegandmywholeteamwas2metocatchupwith3teamslikeMillerandCupertinowhoseteammembershad4trainers. EverywhereI5Iseeother6thgradeteamshandingouttheirbatons接力棒practisingandrunningatfullspeedwhenthebatonreachestheir6.Itmakesmyteam7melooklikeabunchofamateurs业余爱好.Butitwastoolateto8now.Iwasgoingtorunnomatter9. To10mynervesIturnedaroundandwenttositnexttomybestfriendAlisonhopingthatshewouldgivemesome11.HoweverwhenIsatdownnexttoherIknewAlisonwasevenmore12thanme.Shewasrocking13andshewas14likeasnowmaninthesun. So15havinghercomfortmeItoldherthatshewoulddowellandthatshewould16everygirlintherace.IcomfortedherwiththesewordsagainandagainnotrealizingIwasnotjusthelpingAlisonbutalsohelping17. Iknew18ourteamwasnotthebestwewouldgiveitourbestshot.Ikeptthatinmy19andwhenmy20torunfinallycameIwasn'tsosacredanymore. 1.A.excited B.worried C.disappointed D.interested 2.A.speakingabout B.dependingon C.takingup D.gettingonwith 3.A.connected B.unique C.undefeated D.creative 4.A.strange B.handsome C.common D.personal 5.A.look B.run C.study D.fancy 6.A.space B.hand C.purpose D.destination 7.A.exactly B.unfortunately C.especially D.except 8.A.tryout B.takepart C.turnback D.putup 9.A.where B.when C.which D.what 10.A.calm B.arrange C.guide D.pack 11.A.effect B.impression C.comfort D.Entertainment 12.A.unclear B.responsible C.realistic D.nervous 13.A.atatime B.fullofjoy C.inacircle D.backandforth 14.A.shining B.sweating C.performing D.racing 15.A.insteadof B.aswellas C.apartfrom D.alongwith 16.A.attack B.promote C.rediscover D.beat 17.A.myself B.myteam C.others D.herteam 18.A.evenif B.sothat C.nowthat D.asif 19.A.permission B.mind C.imagination D.promise 20.A.reaction B.event C.turn D.Competition
实验室用下列方法测定某水样中O2的含量． 1实验原理 用如图所示装置使溶解在水中的O2在碱性条件下将Mn2+氧化成MnOOH2反应的离子方程式为．再用I﹣将生成的MnOOH2还原为Mn2+反应的离子方程式为MnOOH2+2I﹣+4H+＝Mn2++I2+3H2O．然后用Na2S2O3标准溶液滴定生成的I2反应方程式为I2+2Na2S2O3＝2NaI+Na2S4O6． 2实验步骤 ①打开止水夹a和b从A处向装置内鼓入过量N2此操作的目的是 ②用注射器抽取某水样20.00mL从A处注入锥形瓶 ③再分别从A处注入含mmolNaOH溶液及过量的MnSO4溶液 ④完成上述操作后关闭ab将锥形瓶中溶液充分振荡 ⑤打开止水夹ab分别从A处注入足量NaI溶液并用稀H2SO4溶液调节pH至接近中性 ⑥ ⑦取下锥形瓶向其中加入2～3滴作指示剂 ⑧用0.005mol•L﹣1Na2S2O3滴定至终点． 3数据分析 ①若滴定过程中消耗的Na2S2O3标准溶液体积为3.90mL则此水样中氧O2的含量为单位mg•L﹣1． ②若未用Na2S2O3标准溶液润洗滴定管则测得水样中O2的含量将填“偏大”“偏小”或“不变”． ③步骤⑤中加入适量的H2SO4使溶液接近中性其原因是．
15分Everyoneneedstoknowhowtopreventafire.Itisalsoimportanttoknowwhattodowhenit1breakout. Everyyearover11000people2killorinjuredinhousefires.Thesefirescouldhavebeenavoided.Smokerswhoare3carecauseabout200deathsandover6000fires.Morethanofthose4dieinfiresarepoisonedorharmedbysmoke. Iffirehappensdonotattempttofightthefireunlessitissmall.Tryputtingoutasmallfirewithwater.If5firehasspreadoriftheflamesaremorethan20incheshighshutthedooronitwarneveryoneelseinthebuildingandtellthemtogetout.Youshouldleaveanddial911forthefiredepartment. Before6gointoaroomcheckthedoor.Ifthehandleorthedoorishotdonotopenit!Insteadputclothingorawettowelatthebottomofittokeepsmokeout.Ifthedoorisnothotopenit7slow.Ifthereisarushofsmokeheatcloseitagainandshouttowarn8otherinside. NowopenthewindowandshoutFire!.Seewhetheryoucandropsafelytotheground.Usethis9yourescapecourseifyoucan.Ifyouarenotongroundlevelbreakyourfallbypushingamatoutfirst.Loweryourselfatarm's10longbeforedropping.Onceoutsidestayoutoutsideandmakesurethefiredepartmentiscalled. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
已知函数fx＝lnx+a＞0 Ⅰ求fx的单调区间 Ⅱ如果Px0y0是曲线y＝fx上的任意一点若以Px0y0为切点的切线的斜率k≤恒成立求实数a的最小值．
10分Asweknoweveryonecanmakemistakesbutdon'tworryaboutit.Thefollowingiswhatweshoulddowhenwemakemistakes. Justadmitit.Don'tthinkthatourmistakesarecausedbyothers.1Do'tblameotherpeopleanddon'tcheatourselveseither. 2Inordertostoptheproblemfromgettingworseweshouldactquicklytosolveit.Ifwedon'tactanddealwiththeproblemquicklyit'llonlymakeusfeelmorestressed.Alsoitisnecessarytomakeaplanofactionandcorrctthemistakeaccordingtoit.3. 4ThosewhohavemadethemostmistakescangetanAfortheyaretheoneswhohavelearnedthemost.Themorewelearnfromourmistakestheclevererweare. 5Whatcausedustomakethemistake?Howcanweavoidmakingthesamemistakeinthefuture?Whenweactwithamethodtogetaoodresultdoitthatwaynexttime.Ifwedon'tweshouldstopthinkaboutitchangeitandtryagain. A.Realizethatmakingmistakesisthebestwaytolearn. B.Don'tbeafraidoffailure. C.Bebraveandfacethefactthatwehavemadethemistakes. D.Solveitatonce. E.Sobeawayfromstress. F.Sodecidequicklyandact. G.Thinkaboutwhatwecanlearnfromourmistakes. 1. 2. 3. 4. 5.
8分Whydomendieearlierthanwomen?Thelatestresearchmakesitknownthatthereasoncouldbethatmen'sheartsgointorapiddeclinewhentheyreachmiddleage. Thelargeststudyoftheeffectsofageingonthehearthasfoundthatwomen'slongevitymaybelinkedtothefactthattheirheartsdonotlosetheirpumpingpowerwithage. Wehavefoundthatthepowerofthemaleheartfallsby20﹣25percentbetween18and70yearsofagesaidtheheadofthestudyDavidGoldspinkofliverpooljohnmooresuniversityintheUK. Withinthehearttherearemillionsofcellsthatenableittobeat.betweentheageof20and70one﹣thirdofthosecellsdieandarenotreplacedinmensaidGoldspink.thisispartoftheageingprocess. Whatsurprisesscientistsisthatthefemaleheartseesverylittlelossofthesecells.Ahealthy70﹣year﹣oldwoman'sheartcouldperformalmostaswellasa20﹣year﹣oldone's. ThisgenderdifferencemightjustexplainwhywomenlivelongerthanmensaidGoldspink.Theystudiedmorethan250healthymenandwomenbetweentheagesof18and80focusingonhealthypersonstoremovetheconfusinginfluenceofdisease.TheteamhasyettofindwhyageingtakesagreaterlossonthemaleheartsaidGoldspink. Thegoodnewsisthatmencanimprovethehealthoftheirheartwithregularexercise.goldspinkstressedthatwomenalsoneedregularexercisetopreventtheirlegmusclesbecomingsmallerandweakerastheyage. 1.Thetextmainlytalksabout. A.men'sheartcells B.women'sageingprocess C.thegenderdifference D.heartsandlonglife 2.AccordingtothetexttheUKscientistshaveknownthat. A.womenhavemorecellsthanmenwhentheyareborn B.womencanreplacethecellsthatenablethehearttobeat C.thefemaleheartlosesfewofthecellswithage D.womenneverlosetheirpumpingpowerwithage 3.Ifyouwanttolivelongeryoushould. A.enableyourhearttobeatmuchfaster B.findoutthereasonforageing C.exerciseregularlytokeepyourhearthealthy D.preventyourcellsfrombeinglost 4.Wecanknowfromthepassagethat. A.thereasonwhyageingtakesagreaterlossonthemalehearthasbeenfoundout B.scientistsareonthewaytofindingoutwhythemaleheartlosesmoreofthecells C.theteamhasdonesomethingtopreventthemalefromsufferingthegreaterloss D.womenover70couldlosemoreheartcellsthanthoseattheageof20
下列离子方程式书写不正确的是
8分Itissixo'clockinthemorning.YouareasleepinmyleftarmandIamlearningtheartofone﹣handedtyping.YourmothermoretiredyetmorehappythanI'veeverknownherissoundasleepintheroomnextdoor. Whenyou'reolderwe'lltellyouthatyouwereborninHongKonginthelunaryearofthepig.It'saboysoluckyourneighbourstoldus.Theysaidyouwerethefirstbabytobebornintheblockthisyear.ThistheytolduswasgoodFengShuiinotherwordsapositivesign.NaturallyyourmotherandIwereonlytoohappytobelievethat. Yourcominghasturnedmeupsidedownandinsideout.IampainedbythememoryofeachsufferingchildIhavecomeacrossonmyjourneysasajournalist.Totellyouthetruthit'snearlytoomuchformetoeventhinkofthechildrenbeinghurtandabusedandkilled. LastOctoberinAfghanistanwhenyouweregrowinginsideyourmotherImetSharjaagedtwelvemotherlessfatherlessguidingmethroughthegreyruinsofherhome.Everythingwasgoneshetoldme. ThereisanothermemoryofRwandaandthechurchyardwhereIfoundamotherandherthreeyoungchildrenhuddled蜷缩togetherwherethey'dbeenbeatentodeath.Thechildrenhaddiedholdingontotheirmother. DanielthesememoriesexplainsomeoftheprotectivenessIfeelforyouandtheoccasionalmomentsofblindterrorwhenIimagineanythingbadhappeningtoyou. 1.Wecanseethatthistextiswrittento. A.theauthor'swife B.theauthor'sneighbour C.Daniel D.asufferingchild 2.Theauthormentionssomeofhispainfulmemoriesbecause. A.hewantshissontocareforothers B.hefeelsmorepainthinkingaboutthemasafather C.hehopestoforgetthetragedieshewitnessed D.hisexperiencehasaffectedhismentalhealth 3.Theunderlinedwordblindinthelastparagraphmeans. A.unabletosee B.meaningful C.notclear D.notbasedonreason 4.Whichofthefollowingwordsbestdescribestheauthor'sfeelingwhentypingthistext? A.Critical. B.Regretful. C.Loving. D.Calm.
如图程序框图的算法思路源于我国古代数学名著九章算术中的“更相减损术”．执行该程序框图若输入ab分别为1418则输出的a＝
下列说法正确的是
如图是无机物A～M在一定条件下的转化关系部分产物及反应条件未列出．其中I是由第三周期元素组成的单质中熔点最高的金属K是一种红棕色气体． 1在周期表中组成单质G的元素位于 2在反应⑦中氧化剂与还原剂的物质的量之比为试举出反应⑦的一种工业用途 3在②③⑥⑨中既属于化合反应又属于非氧化还原反应的是填序号． 4反应④的离子方程式是． 5实验室中检验M中所含阳离子的最典型方法是 6工业上制备J的第一步反应原理可用方程式表示为 7将化合物D与KNO3KOH共融可制得一种“绿色”环保高效净水剂K2FeO4高铁酸钾同时还生成KNO2和H2O．该反应的化学方程式是．
已知函数fx＝lnxgx＝x2﹣bxb为常数． Ⅰ函数fx的图象在点1fx处的切线与函数gx的图象相切求实数b的值 Ⅱ若b≥2∀x1x2∈12]且x1≠x2都有|fx1﹣fx2|＞|gx1﹣gx2|成立求实数b的值．
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