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某种野生型淡水藻经过人工诱变得到甲、乙两种突变藻,甲藻的类胡萝卜素含量为野生型的80.8%,乙藻的叶绿素a含量为野生型的128.8%,两种突变藻的其它色素与野生型藻含量相当.如图是野生型藻光合速率随...
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高三下学期生物《》真题及答案
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假设为了鉴别一个特定的基因已经成功得到了一种可选择的细菌突变株可是为了更具说服力必须证明观察到的突变
用致突变剂处理细菌,并且分离一个回复野生型表型的突变体
用携带突变基因的质粒转化突变株后不能回复为野生型,即不能得到反式互补
用携带突变基因的质粒转化野生型菌株后,不能产生突变表型,即不能得到反式互补
用携带突变基因的质粒转化突变菌株后可以产生野生型表型,即可以反式互补
用携带突变基因的质粒转化突变菌株后可回复野生型表型,即可以反式互补
某种野生型淡水藻经过人工诱变得到甲乙两种突变藻甲藻的类胡萝卜素含量为野生型的80.8%乙藻的叶绿素
通过下列哪些方法可以得到大肠杆菌组氨酸缺陷型的回复突变菌株
转导
紫外线诱变
与野生型菌株发生接合
转染
转化
一只雌鼠的一条染色体上某基因发生了突变使野生型性状变为突变型性状该雌鼠与野生型雄鼠杂交Fl的雌雄中均
突变型(♀)×突变型(♂)
突变型(♀)×野生型(♂)
野生型(♀)×野生型(♂)
野生型(♀)×突变型(♂)
诱变育种的出发菌株的选择原则包括许多方面和是重要的两个方面
对诱变剂敏感、变异幅度大
最好选用已经过生产选育的自发突变株
最好产生芽孢
选用没发生过其它变异的菌株
菌株野生型产生荚膜
现有水生生活甲乙两种突变藻甲藻的类胡萝卜素含量为野生型的90%乙藻的叶绿素a含量为野生型的130%
a和b是不同顺反子的突变基因型ab/++和a+/+b的表型分别为
野生型和野生型
野生型和突变型
突变型和野生型
突变型和突变型
已知abcd是某细菌DNA片段上的4个基因如图中W.表示野生型①②③分别表示三种缺失不同基因的突变体
基因a
基因b
基因c
基因d
将一只突变型桑蚕雄性与一只野生型桑蚕雌性交配得到的F1野生型与突变型之比为21且雄性与雌个体数之比也
某种细菌体内某氨基酸X的生物合成途径如图这种细菌的野生型能在基本培养基满足野生型细菌生长??的简单培
一只雌鼠的一条染色体上某基因发生了突变使野生型性状变为突变型性状该雌鼠与野生型雄鼠杂交Fl的雌雄中均
突变型(♀)×突变型(♂)
突变型(♀)×野生型 (♂)
野生型(♀)×野生型(♂)
野生型(♀)×突变型(♂)
拟南芥超矮生型突变体有激素合成缺陷型和激素不敏感型两种.研究者以野生型和某种超矮生型突变体拟南芥为材
图甲表明,野生型拟南芥的赤霉素浓度始终高于该超矮生型突变体
图乙表明,高浓度的生长素对野生型拟南芥茎的生长具有抑制作用
实验表明,该种超矮生型突变体属于激素不敏感型
实验表明,若用适宜浓度的赤霉素和生长素同时处理,可提高该突变体莲的长度
某种细菌体内某氨基酸X的生物合成途径如图这种细菌的野生型能在基本培养基满足野生型细菌生长的简单培养基
某种细菌体内某氨基酸X的生物合成途径如图这种细菌的野生型能在基本培养基满足野生型细菌生长的简单培养基
已知abcd是某细菌DNA片段上的4个基因图中W.表示野生型①②③分别表示三种缺失不同基因的突变体若
基因a
基因b
基因c
基因d
将一只突变型桑蚕雄性与一只野生型桑蚕雌性交配得到的F.1野生型与突变型之比为21且雄性与雌个体数之比
野生型大肠杆菌能在基本培养基上生长用射线照射野生型大肠杆菌得到一突变株该突变株在基本培养基上培养时必
野生型大肠杆菌可以合成氨基酸甲
野生型大肠杆菌代谢可能不需要氨基酸甲
该突变株可能无法产生氨基酸甲合成所需的酶
该突变株中合成氨基酸甲所需酶的功能可能丧失
某种细菌生活在75℃的环境中通过诱变得到了10株该细菌DNA复制的温度敏感型突变株请设计一个简单的实
有很多突变对于野生型基因是隐性的也就是说在一个含有突变型和野生型基因二倍体细胞中野生型的特性能够得到
某种细菌体内某氨基酸X.的生物合成途径如图这种细菌的野生型能在基本培养基满足野生型细菌生长的简单
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如图抛物线y=ax²+6axa为常数a>0与x轴交于OA两点点B为抛物线的顶点点D的坐标为t0-3<t<0连接BD并延长与过OAB三点的⊙P相交于点C.1求点A的坐标2过点C作⊙P的切线CE交x轴于点E.①如图1求证CE=DE②如图2连接ACBEBO当a=∠CAE=∠OBE时求-的值.
分解因式am²-9a=
把一个鸡蛋分别放入盛满不同浓度盐水的甲乙两烧杯中如图从甲杯中溢出盐水的质量是40g从乙杯中溢出盐水的质量是50g可知鸡蛋的质量是g甲乙两杯中盐水密度的比值0.8选填>或=或<
先化简再求值其中a=3.
如图所示容器中间用隔板分成左右两部分底面积之比为23隔板下部有一圆孔用薄橡皮膜封闭圆孔直径可忽略不计橡皮膜两侧压强不同时其形状为一凹面.小明在左侧中加入水右侧容器内倒入另一种液体发现当橡皮膜变平时右侧液面低于左侧则水对容器底的压强液体对容器底的压强他将物体A放入另一种液体中处于漂浮放入水中沉底两侧液体对容器底的压强变化量相等则物体A的密度为kg/m³.
有一密闭的圆台形容器如图所示内装一定质量的液体如果把它倒置液体对容器底面的压力压强选填变大或变小或不变.
Morestudentsthaneverbeforearetakingagap﹣year间隔年beforegoingtouniversity.Itusedtobecalledtheyearoffbetweenschoolanduniversity.Thegap﹣yearphenomenonoriginated起源withthemonthsleftovertoOxbridgeapplicantsbetweenentranceexamsinNovemberandthestartofthenextacademicyear. Thisyear25310studentswhohaveacceptedplacesinhighereducationinstitutionshaveputofftheirentryuntilnextyearaccordingtostatisticsonuniversityentranceprovidedbyUniversityandCollegeAdmissionsSerbiceUCAS. Thatisarecord14.7%increaseinthenumberofstudentstakingagapyear.TonyHigginsfromUCASsaidthatthestatisticsaregoodnewsforeveryoneinhighereducation.Studentswhotakeawell﹣plannedyearoutaremorelikelytobesatisfiedwithandcompletetheirchosencourse.Studentswhotakeagapyearareoftenmorematureandresponsiblehesaid. Butnoteveryoneishappy.OwainJamesthepresidentoftheNationalUnionofStudentsNUSarguedthattheincreaseisevidenceofstudenthadship﹣youngpeoplearebeingforcedintoearningmoneybeforefinishingtheireducation.Newstudentsarenowawarethattheyarelikelytoleaveuniversityupto£15000indebt.Itisnotsurprisingthatmoreandmorestudentsaretakingagapyeartoearnmoneytosupporttheirstudyforthedegree.NUSstatisticsshowthatover40%ofstudentsareforcedtoworkduringtermtimeandthefigureincreasesto90%duringvacationperiodshesaid. 29.Whatdowelearnaboutthegapyearfromthetext A.Itisflexibleinlength. B.Itisatimeforrelaxation. C.Itisincreasinglypopular. D.Itisrequiredbyuniversities. 30.AccordingtoTonyHigginsstudentstakingagapyear. A.arcbetterpreparedforcollegestudies B.knowalotmoreabouttheirfuturejobs C.aremorelikelytoleaveuniversityindebt D.haveabetterchancetoentertopuniversities 31.HowdoesOwainJamesfeelaboutthegap﹣yearphenomenon A.He'spuzzled. B.He'sworried. C.He'ssurprised. D.He'sannoyed. 32.WhatwouldmoststudentsdoontheirvacationaccordingtoNUSstatistics A.Attendadditionalcourses. B.Makeplansforthenewterm. C.Earnmoneyfortheireducation. D.Preparefortheirgraduatestudies.
为了测量某石块的密度实验中学物理兴趣活动组的同学利用一只玻璃杯一个量筒和适量的水做了如下实验1在量筒内倒入60cm³的水.2将玻璃杯开口向上漂浮在量筒内的水面上如图甲所示此时与84cm³刻度线相平.3将石块放入玻璃杯中让玻璃杯漂浮在量筒内的上如图乙所示此时与100cm³刻度线相平.4取出玻璃杯将石块沉没在量筒内的水中如图丙所示此时与64cm³刻度线相平.根据以上数据可知乙图中烧杯受浮力N石块的密度是kg/m³
Mycolortelevisionhasgivenmenothingbutaheadache.IwasabletobuyitalittleoverayearagobecauseIhadmyrelativesgivememoneyformybirthdayinsteadofalotofclothesthatwouldn'tfit.IletasalesclerkfoolmeintobuyingadiscontinuedmodelIrealizedthisadaylatewhenIsawnewspaperadvertisementsforthesetatseventy﹣fivedollarslessthanIhadpaidThesetworkedsobeautifullywhenIfirstgotithomethatIwouldkeepitonuntilstationssignedoffforthenightFortunatelyIdidn'tgotanychannelsshowingall﹣nightmoviesorIwouldneverhavegottentobed. ThenIstarteddevelopingaproblemwiththesetthatinvolvedstatic静电noise.Forsomereasonwhencertainshowsswitchedintoacommercialaloudnoisewouldsoundforafewseconds.GraduallythisnoisebegantoappearduringashowandtogetridofitIhadtochangetoanotherchannelandthenchangeitback.SometimesthistechniquewouldnotworkandIhadtopickupthesetandshakeittoremovethesound.Iactuallybegantobuildupmyarmmuscles肌肉shakingmyset. WhenneitherofthesemethodsremovedthestaticnoiseIwouldsithelplesslyandwaitforthenoisetogoaway.AtlastIendeduphittingthesetwithmyfistanditstoppedworkingaltogether.Mytriptotherepairshopcostme$62andthesetisworkingwellnowbutIkeepexpectingmoretrouble. 21.WhydidtheauthorsayhewasfooledintobuyingtheTVset A.Hegotanoldermodelthanhehadexpected. B.Hecouldn'treturnitwhenitwasbroken. C.Hecouldhaveboughtitatalowerprice. D.Hefailedtofindanymovieshowsonit. 22.WhichofthefollowingcanbestreplacethephrasesignedoffinParagraph1 A.endedalltheirprograms B.providedfewerchannels C.changedtocommercials D.showedall﹣nightmovies 23.HowdidtheauthorfinallygethisTVsetworkingagain A.Byshakingandhittingit. B.Byturningitonandoff. C.Byswitchingchannels. D.Byhavingitrepaired. 24.Howdoestheauthorsoundwhentellingthestory A.Curious B.Anxious C.Cautious D.Humorous.
Yourhousemayhaveaneffectonyourfigure.Expertssaythewayyoudesignyourhomecouldplayaroleinwhetheryoupackonthepoundsorkeepthemoff.Youcanmakeyourenvironmentworkforyouinsteadofagainstyou.Herearesomewaystoturnyourhomeintopartofdietplan. Openthecurtainsandturnupthelights.Darkenvironmentsaremorelikelytoencourageovereatingforpeopleareoftenlessself﹣consciouswhenthey'reinpoorlylitplaces﹣andsomorelikelytoeatlotsoffood.Ifyourhomedoesn'thaveenoughwindowlightgetmorelampsandfloodtheplacewithbrightness. Mindthecolors.Researchsuggestswarmcolorsfuelourappetites胃口.Inonestudypeoplewhoatemealsinablueroomconsumed消耗33percentlessthanthoseinayelloworredroom.Warmcolorslikeyellowmakefoodappearmoreappetizingwhilecoldcolorsmakeusfeellesshungry.Sowhenit'stimetorepaintgoblue. Don'tforgettheclock﹣﹣﹣ortheradio.Peoplewhoeatslowlytendtoconsumeabout70fewercalories卡路里permealthanthosewhorushthroughtheirmeals.Beginkeepingtrackofthetimeandtrytomakedinnerlastatleast30minutes.Andwhileyou'reatitactuallysitdowntoeat.Ifyouneedsomehelpslowingdownturnonrelaxingmusic.Itmakesyoulesslikelytorushthroughameal. Downsizethedishes.Bigservingbowlsandplatescaneasilymakeusfat.Weeatabout22percentmorewhenusinga12﹣inchplateinsteadofa10﹣inchplate.Whenwechoosealargespoonoverasmalleronetotalintake摄入jumpsby14percent.Andwe'llpourabout30percentmoreliquidintoashortwideglassthanatallskinnyglass. 1.Thetextisespeciallyhelpfulforthosewhocareabout. A.theirhomecomforts B.theirbodyshape C.housebuying D.healthydiets 2.Ahomeenvironmentinbluecanhelppeople. A.digestfoodbetter B.regaintheirappetites C.burnmorecalories D.reducefoodintake 3.Whatarepeopleadvisedtodoatmealtimes? A.Fatquickly. B.Playfastmusic. C.Usesmallerspoons. D.Turndownthelights. 4.Whatcanbeasuitabletitleforthetest? A.IsYourHouseMakingYouFat? B.WaysofServingDinner C.EffectsofSelf﹣Consciousness D.IsYourHomeEnvironmentRelaxing?
Theadobedwellings土坯房61buildbythePuebloIndiansoftheAmericanSouthwestareadmiredbyeven62mostmodernofarchitectsandengineers.Inadditiontotheirsimplebeautywhatmakestheadobedwellingsadmirableistheir63abletoairconditionahousewithout64useelectricequipment.Wallsmadeofadobetakeintheheatfromthesunonhotdaysandgiveoutthatheat65slowduringcoolnightsthuswarningthehouse.Whenanewdaybreaksthewallshavegivenuptheirheatandarenowcoldenough66coolthehouseduringthehotday67thesametimetheywarmupagainforthenightThiscycle68godayafterdayThewallswarmupduringthedayandcooloffduringthenightandthusalwaysatimelyoffset抵消fortheoutsidetemperatures.As69naturearchitectsthePuebloIndiansfiguredoutexactly70thicktheadobewallsneededtobetomakethecycleworkonmostdays. 61. 62. 63. 64. 65. 66. 67. 68. 69. 70.
下列说法不正确的是. 1乙醛分子的比例模型2铝离子的结构示意图 3次氯酸的结构式H﹣OCl4甲基的电子式 5硫的原子结构示意图6NH4Cl的电子式 7原子核内有8个中子的氧原子O.
如图所示是中国航母瓦良格号训练时的图片.当飞机飞回航母后
40℃时等质量的两份饱和石灰水①冷却至10℃②加少量CaO并保持温度仍为40℃.回答下列问题填“增大”“减小”或“不变” 1CaOH2的溶解度①②. 2溶液的质量①②. 3溶质的质量分数①②. 4溶液中Ca2+的数目①②.
如图所示是探究物体动能的大小与哪些因素有关的实验装置实验中让钢球从斜面上某个高度由静止沿斜面滚下在底部与静止在水平面上的木块发生碰撞木块沿水平向右运动直至停止.1实验中是通过观察来判断钢球的动能大小.2让同一钢球从斜面的不同高度由静止开始滚下目的是探究钢球的动能大小与的关系.3木块最终会停下来的主要原因是4如果水平面绝对光滑则选填能或不能得出正确结论
Wheredoyougowhenyouwanttolearnsomething?Afriend?Atutor?Theseareall41acesoflearning.Butitmaywellbethatthelearningyoureallywant42somewhereelseinstead.Ihadthe43ofseeingthisfirsthandona44. Mydaughterplaysonarecreationalsoccerteam.Theydidverywellthisseasonandso45atournamentwhichnormallywasonlyformoreskilledclubteams.Thisledtosome46experiencesonSaturdayastheyplayedagainstteams47trained.Throughthefirsttwogamesher48didnotgetonseriousshotongoal.AsapparentI49seeingmydaughterplayingherbest50stilldefeated. ITseemedthatsomethingclickedwiththe51betweenSaturdayandSunday.Whenthey52fortheirSundaygametheywere53different.Theyhadbegunintegrate融合thekindsofplayandteamworktheyhad54thedaybeforeintotheir55.Theyplayedaggressivelyand56scoredagoal. It57methatplayingagainsttheotherteamwasagreat58momentforallthegirlsontheteam.Ithinkitisageneralprinciple.59isthebestteacher.Thelessonstheymaynotbe60whattheywouldhavegotteninschool.Butarecertainlymorepersonalandmeaningfulbecausetheyhadtoworkthemoutontheirown. 41.A.public B.traditional C.official D.special 42.A.passes B.works C.lies D.ends 43.A.dream B.idea C.habit D.chance 44.A.trip B.holiday C.weekend D.square 45.A.won B.entered C.organized D.watched 46.A.painful B.strange C.common D.practical 47.A.less B.poorly C.newly D.better 48.A.fans B.tutors C.class D.team 49.A.imagined B.hated C.avoided D.missed 50.A.if B.or C.but D.as 51.A.girls B.parents C.coaches D.viewers 52.A.dressed B.showedup C.madeup D.planned 53.A.slightly B.hardly C.basically D.completely 54.A.seen B.known C.heard D.read 55.A.styles B.training C.game D.rules 56.A.even B.still C.seldom D.again 57.A.confused B.struck C.reminded D.warned 58.A.touching B.thinking C.encouraging D.learning 59.A.Experience B.Independence C.Curiosity D.Interest 60.A.harmfulto B.mixedwith C.differentfrom D.appliedto.
根据相似多边形的定义我们把四个角分别相等四条边成比例的两个凸四边形叫做相似四边形.相似四边形对应边的比叫做相似比.1某同学在探究相似四边形的判定时得到如下三个命题请判断它们是否正确直接在横线上填写真或假.①条边成比例的两个凸四边形相似命题②三个角分别相等的两个凸四边形相似命题③两个大小不同的正方形相似.命题2如图1在四边形ABCD和四边形A1B1C1D1中∠ABC=∠A1B1C1∠BCD=∠B1C1D1求证四边形ABCD与四边形A1B1C1D1相似.3如图2四边形ABCD中AB∥CDAC与BD相交于点O过点O作EF∥AB分别交ADBC于点EF.记四边形ABFE的面积为S1四边形EFDE的面积为S2若四边形ABFE与四边形EFCD相似求的值.
如图函数y=k为常数k>0的图象与过原点的O的直线相交于AB两点点M是第一象限内双曲线上的动点点M在点A的左侧直线AM分别交x轴y轴于CD两点连接BM分别交x轴y轴于点EF.现有以下四个结论①△ODM与△OCA的面积相等②若BM⊥AM于点M则∠MBA=30°③若M点的横坐标为1△OAM为等边三角形则k=2+④若MF=MB则MD=2MA.其中正确的结论的序号是
下列各组中两种气体的原子数一定相等的是. 1温度相同体积相同的O2和N2. 2质量相等密度相等的N2和C2H4. 3体积相等密度相等的CO和C2H4. 4压强相同体积相同的N2和O2. 5同质量不同密度的N2和CO. 6同体积同密度的C2H4和C4H8.
Trainingforamarathonrequirescarefulpreparationandsteadygradualincreasesinthelengthoftheruns.36buythebest﹣fittingbest﹣builtrunningshoesyoucanfind.Noonecansaywhichbrandwillworkbestforyouorfeelbestonyourfeetsoyouhavetorelyonyourexperienceandonthefeelofeachpairasyoushop.Whenyouhavefoundshoesthatseemrightwalkinthemforafewdaystodouble﹣checkthefit.37.Asalwaysyoushouldstretch伸展atleasttenminutesbeforeeachruntopreventinjuries. Duringthefirstweekdonotthinkaboutdistancebutrunfiveminuteslongereachday.38itiswisetotakeadayofftorest.Butduringthenextweeksetagoalofatleastamileandahalfperrun.39.Aftertwoweeksstarttimingyourself.40.Dependingonthekindofraceyouplantoenteryoucansetupatimetablefortheremainingweeksbeforetherace. A.Aftersixdays B.Foragoodmarathonrunner C.Beforeyoubeginyourtraining D.Witheachdayincreasethedistancebyahalfmile E.Iftheystillfeelgoodyoucanbeginrunninginthem F.Timespentforpreparationraisesthequalityoftraining G.Nowyouarereadytofigureoutagoalofimprovingdistanceandtime. 36. 37. 38. 39. 40.
足量的SO2通入下列溶液中后是否产生沉淀能产生沉淀的说明沉淀的成分.
在一个不透明的袋子中有若千个小球这些球除颜色外无其他差别从袋中随机摸出一球记下其颜色这称为一次摸球试验然后把它重新放回袋中并摇匀不断重复上述过程.以下是利用计算机模拟的摸球试验统计表 根据试验所得数据估计“摸出黑球”的概率是结果保留小数点后一位
如图正方形ABCD点EF分别在ADCD上且DE=CFAF与BE相交于点G.1求证BE=AF2若AB=4DE=1求AG的长.
一个空的塑料药瓶瓶口扎上橡皮膜竖直地浸入水中一次瓶口朝上一次瓶口朝下这两次药瓶在水中的位置相同如图所示.可以看到橡皮膜都向内凹图中橡皮膜向内凹得多.若在进行以上实验时甲塑料药瓶能刚好悬浮在水中则换成乙种情况时塑料药瓶会填上浮下沉或悬浮.
“远征号”潜水艇在东海执行完任务后返回到长江某基地请在图中画出潜水艇加速上浮过程中所受重力和浮力的示意图.
下列物质中①金刚石②氨气③氧气④水⑤CO2⑥SiO2⑦SO2⑧Fe⑨冰⑩碘蒸气⑪C3H8⑫液氯⑬液氨⑭NaOH 1由分子构成的是 2由原子构成的是 3由离子构成的是.
如图是中国第一艘航母—辽宁舰满载时吃水深度为10m排水量为7×104t.已知ρ海水=1.0×103kg/m3求1辽宁舰满载时受到的浮力是多少2辽宁舰满载时舰底0.5m²的面积受到海水的压力是多少
ChooseYourOne﹣DayTours TourA﹣Bath&StonchengeincludingentrancefeestotheancientRomanbathroomsandStonehenge﹣£until26Marchand£39thereafter. Visitthecitywithover2000yearsofhistoryandBathAbbeytheRoyalCrescentandtheCostumeMuseum.Stonehengeisoneoftheworld'smostfamousprehistoricmonumentsdatingbackover5000years. TourB﹣Oxford&StratfordincludingentrancefeestotheUniversityStMary'sChurchTowerandAnneHathaway'shouse一32until12Marchand36thereafter. OxfordIncludesaguidedofEngland'soldestuniversitycityandcolleges.Lookoverthecityofdreamingspires尖顶formStMary'sChurchTower.StratfordIncludesaguidedtourexploringmuchoftheShakespearewonder. TourC﹣WindsorCastle&HamptonCourtincludingentrancefeestoHamptonCourtPalace﹣﹣£34untilMarchand£37thereafter. IncludesaguidedtourofWindsorandHamptonCourtHenryMill'sfavouritepalace.FreetimetovisitWindsorCastleentrancefeesnotincluded.With500yearsofhistoryHamptonCourtwasoncethehomeoffourKingsandoneQueen.Nowthisformerroyalpalaceisopentothepublicasamajortouristattraction.Visitthepalaceanditsvarioushistoricgardenswhichincludethefamousmaze迷宫whereitiseasytogetlost! TourD﹣CambridgeincludingentrancefeestotheTowerofSaintMarytheGreat﹣£33.until18Marchand£37thereafter. IncludesaguidedtourofCambridgethefamousuniversitytownandthegardensofthe18thcentury. 33.WhichtourwillyouchooseifyouwanttoseeEngland'soldestuniversitycity? A.TourAB.TourBC.TourCD.TourD 34.Whichofthefollowingtourschargesthelowestfeeon17March? A.WindsorCastle&HamptonCourt. B.Oxford&Stratford C.Bath&Stonehenge. D.Cambridge. 35.WhyisHamptonCourtamajortouristattraction? A.Itusedtobethehomeofroyalfamilies. B.Itusedtobeawell﹣knownmaze C.ItistheoldestpalaceinBritain D.Itisaworld﹣famouscastle.
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