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四环素、链霉素、红霉素等抗生素能抑制细菌的生长，它们有的能阻碍细菌细胞壁的形成，导致细菌在低渗环境下膨胀破裂死亡；有的能干扰细菌核糖体的形成；有的能阻止tRNA和mRNA的结合．请根据以上事实判断下...
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高三下学期生物《》真题及答案
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四环素链霉素等抗生素能抑制细菌的生长它们有的能干扰细菌核糖体的形成有的能阻止tRNA和mRNA的结合
细菌蛋白质在核糖体中合成并由内质网进行初步的加工
细菌核糖体的形成与核仁有关
抗生素可在转录水平上抑制蛋白质的合成
抗生素可在翻译水平上抑制蛋白质的合成
可影响骨牙生长的抗生素是
四环素
氯霉素
青霉素
链霉素
红霉素
四环素链霉素氯霉素红霉素等抗生素能抑制细菌的生长它们有的能干扰细菌核糖体的形成有的能阻止tRNA和m
染色体活动
DNA复制过程
转录过程
翻译过程
在抑制细菌蛋白合成的抗生素中哪个不是通过核糖体30s亚基发挥作用的
庆大霉素
米诺环素
红霉素
链霉素
四环素
四环素链霉素氯霉素红霉素等抗生素均能抑制细菌的生长它们有的能干扰细菌核糖体的形成有的能阻止tRNA和
染色体活动
DNA复制过程
转录过程
翻译过程
能抑制细菌蛋白质合成对G+菌作用强于G-菌的广谱抗生素是
链霉素
阿奇霉素
林可霉素
氯霉素
四环素
抗生素能抑制白喉杆菌生长缩短病程和带菌时间治疗白喉时应首选哪种抗生素
红霉素
庆大霉素
青霉素
头孢菌素
四环素
能抑制细菌细胞壁合成的抗生素是
庆大霉素
氨苄青霉素
红霉素
四环素
可抑制骨髓造血功能的抗生素是
四环素
氯霉素
链霉素
红霉素
青霉素
能抑制细菌蛋白质合成对G菌作用强于G菌的广谱抗生素是
链霉素
阿奇霉素
林可霉素
氯霉素
四环素
可能抑制骨髓造血功能的抗生素是
氯霉素
四环素
链霉素
青霉素
红霉素
能抑制细菌蛋白质生物合成过程进行的抗生素是
氯霉素
四环素
红霉素
链霉素
以上都是
可阻碍细菌细胞壁形成的抗生素是
链霉素
庆大霉素
四环素
红霉素
青霉素
抗生素能抑制白喉杆菌生长缩短病程和带菌时间治疗白喉时应首选的抗生素是
红霉素
庆大霉素
青霉素
四环素
头孢菌素
能抑制细菌蛋白质合成对G菌作用强于G菌的广谱抗生素是
链霉素
阿奇霉素
林可霉素
氯霉素
四环素
四环素链霉素氯霉素红霉素等抗生素能抑制细菌的生长它们有的能干扰细菌核糖体的形成有的能阻止tRNA和t
染色体活动
DNA复制过程
转录过程
翻译过程
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下列关于运动和力的说法中正确的是
Asiatreatsilentanybodypayfor 1Hearingthebadnewshesatdown. 2SpringFestivaliscelebratedinmanycountries. 3It'sterriblyhotoutside.Thereisn'tinthesquare. 4Theoldmantakesgoodcareofhisdoganditasafriend. 5I'msoexcitedthatmyparentsagreedtomytriptoFrance.
如图“长春”舰满载时排水量为7.8×106kg吃水深度6m发动机工作时的效率为80%海水的密度为1.0×103kg/m3g＝10Nkg求 1满载时“长春”舰受到的浮力有多大 2“长春”舰底30cm2的面积上受到海水的压力是多少 3“长春”舰以36km/h的速度匀速航行6h海水平均阻力为1.2×106N则这一过程中军舰发动机的总功率为多少
某英文网站正在举办以MySchoolLife为主题的征文活动.假设你是李华请用英语写一篇短文投稿. 注意1.文中必须包括表格中全部内容要点可适当发挥参考词汇仅供选择使用 2.文中不得出现真实的校名和人名 3.词数80﹣100 4.短文的开头已给出不计入总词数. MySchoolLife I'mLiHuafromSunnyHillMiddleSchoolinChina.I'dliketosharemyschoollifewithyou.
如图所示为了“测量滑动摩擦力”要沿水平方向拉动木块并使木块做匀速直线运动这样做的理由是滑动摩擦力与拉力是一对力图中弹簧测力计的 分度值是N测出的滑动摩擦力为N．
Asiatreatsilentanybodypayfor 1Hearingthebadnewshesatdown. 2SpringFestivaliscelebratedinmanycountries. 3It'sterriblyhotoutside.Thereisn'tinthesquare. 4Theoldmantakesgoodcareofhisdoganditasafriend. 5I'msoexcitedthatmyparentsagreedtomytriptoFrance.
InternationalMuseumDayiscoming.Herearesomespecialmuseumsthatyoumustsee. 1Ifyou'reinterestedinartundertheseayoumaygoto. A.SweetMuseum B.CancunUnderwaterMuseum C.MuseumofFailure D.MuseumofBrokenRelationships 2AccordingtothepassagewhichofthefollowingisTRUE? A.PeoplecantastethecandiesonshowinSweetMuseum. B.PeoplelearnaboutsuccessstoriesinMuseumofFailure. C.ObjectsinMuseumofBrokenRelationshipshavetheirstories. D.ThematerialofsculpturesinCancunUnderwaterMuseumisharmful. 3Thepassageisprobablyfromthecolumn栏目ofinamagazine. A.Culture B.Health C.Sports D.Food
在伏安法测电阻Rx的实验中． 1实验时如图甲所示若只有Rx断路开关闭合后电路中可能出现的一种现象是电流表示数为A或电压表示数接近V． 2在实验过程中发现电压表不能使用小明将滑动变阻器调到最大值作为定值电阻R0使用R0阻值已知设计了如图乙所示的电路测量Rx阻值测量时只闭合S1电流表示数为I1只闭合S2电流表示数为 I2则S1闭合时电阻Rx两端的电压Ux＝电阻Rx＝均选用I1I2和R0表示． 3因图乙不能测量多组数据于是小明向老师借了一只定值电阻R0R0值已知设计了如图丙所示的实验电路重复3中的测量步和计算方法并多次测量求出了电阻Rx的阻值．小明得出的Rx阻值是 选填“正确”“错误”的理由是．
InternationalMuseumDayiscoming.Herearesomespecialmuseumsthatyoumustsee. 1Ifyou'reinterestedinartundertheseayoumaygoto. A.SweetMuseum B.CancunUnderwaterMuseum C.MuseumofFailure D.MuseumofBrokenRelationships 2AccordingtothepassagewhichofthefollowingisTRUE? A.PeoplecantastethecandiesonshowinSweetMuseum. B.PeoplelearnaboutsuccessstoriesinMuseumofFailure. C.ObjectsinMuseumofBrokenRelationshipshavetheirstories. D.ThematerialofsculpturesinCancunUnderwaterMuseumisharmful. 3Thepassageisprobablyfromthecolumn栏目ofinamagazine. A.Culture B.Health C.Sports D.Food
在一次课外探究中王华观察了他家的某品牌双色电烤箱．看说明书后得知电烤箱采用双控电路电路如图所示S为总开关S1和S2为两个温控开关R1和R2为上下两层的加热电阻上下同时加热时额定功率为1600W其中R1＝3R2． 1上下两层同时正常工作时R1消耗的电功率是多少瓦 2只有R1正常工作时通过R1的电流是多少计算结果保留一位小数 3王华决定用家中的电能表和手表测量做晚饭时电烤箱的实际功率．他观察家里电能表和手表测量做晚饭时电烤箱的实际功率．他观察家里电能表标有220V2040A50Hz3200r/kW•h的字样．于是他关闭了家中所有其他用电器仅让电烤箱单独工作上下层同时加热30秒电能表转盘转过了32转请计算电烤箱的实际功率是多少瓦
下列现象是由于光的反射形成的是
Intheparkyouseeagroupofpeoplealllookingupatthesky.Withoutthinkingaboutityoulookupwardstoo.Why?Intheconcertsomeonebeginstoclapandsuddenlythewholeroomjoinsin.Youdotoo.Why? Sometimeswefeelweareactingcorrectlywhenwedothesameasothers.Themorepeoplefollowanideathebetterortruerwethinktheideais.It'sthesocialproof社会认同感thatworks. ThescientistAschcarriedoutanexperiment.Itshowshowsocialproofcaninfluenceus.InaroomamanisshownLine1andnexttoitarethreelinesABC.AislongerCisshorterandBisaslongasLine1.HemusttellwhichofthethreelinesisaslongasLine1.WhenthemanisalonehegivesthecorrectanswerB.ThenfiveothermenentertheroomandeachofthemgivestheanswerCastheyweretoldto.NowthemanchangeshisideaandgivestheanswerC.Aschgotthesameresultmanytimesamongdifferentsubjects实验对象. Whydoweactlikethis?Wellinthepastfollowingotherswasawaytokeepfromdanger.Supposethat5000yearsagoyouwerehunting打猎withfriends.Suddenlytheyallranaway.Whatwouldyouhavedone?Wouldyouhavestayed?Noyouwouldhaveruntoo.Wearedescendants后代ofthosewhocopiedothers'action.Itissodeeplyplantedinourmindthatwestilluseitnow. Socialproofhasspecialpower.Theadvertisingindustryforexampleoftenmakesuseofit.Sobecarefulwheneveracompanysaysitsproductisthemostpopular. 1Atthebeginningofthepassagethewriterleadsinthetopicby. A.tellingastory B.givingexamples C.answeringquestions D.showingamap 2AccordingtoParagraph3theexperimentbyAschshows. A.followingothersisalwaysright B.socialproofmaychangepeople'sideas C.it'sdifficulttocarryouttheexperiment D.peoplecanstudybetteriftheyarealone 3TheunderlinedwordItinParagraph4refersto. A.runningwithothers B.huntingwithfriends C.copyingothers'action D.doingsomethingdifferent 4Accordingtothepassagewecaninfer推断that. A.it'simportanttorunwithothersanytime B.productsintheadvertisementarethebest C.wemustn'tcopyothers'actiontokeepsafe D.weneedtothinktwicebeforefollowingothers
某英文网站正在举办以MySchoolLife为主题的征文活动.假设你是李华请用英语写一篇短文投稿. 注意1.文中必须包括表格中全部内容要点可适当发挥参考词汇仅供选择使用 2.文中不得出现真实的校名和人名 3.词数80﹣100 4.短文的开头已给出不计入总词数. MySchoolLife I'mLiHuafromSunnyHillMiddleSchoolinChina.I'dliketosharemyschoollifewithyou.
如下图所示是一手压电筒按压手柄塑料齿轮带动线圈内磁性飞轮高速旋转使灯泡发光．下列四图中与这一过程的工作原理相同的是
在测量小灯泡电功率的实验中电源电压恒为6V小灯泡的额定电压为2.5V正常发光时灯丝电阻约为10Ω所用滑动变阻器的最大阻值40Ω．1请用笔画线代替导线在图甲中完成实物电路的连接2同学们进行试触时发现小灯泡不发光电流表无示数电压表有示数则电路中发生的故障可能是选填小灯泡断路小灯泡短路或滑动变阻器处断路3某次实验中同学们看到电压表示数为2V要使灯泡L正常发光应向选填A或B端移动滑片同时视线应注意观察选填电流表或电压表示数直到灯泡正常发光．当小灯泡正常发光时电流表示数如图乙示数则小灯泡的额定功率是W．
如图所示鱼缸中只有一条小鱼而眼睛从图中位置可以观察到两条一条鱼的位置变浅另一条鱼变大．前者是由于形成的选填“实”或“虚”像后者是由于鱼缸的右侧部分等效于凸透镜而形成的选填“实”或“虚”像．
某英文网站正在举办以MySchoolLife为主题的征文活动.假设你是李华请用英语写一篇短文投稿. 注意1.文中必须包括表格中全部内容要点可适当发挥参考词汇仅供选择使用 2.文中不得出现真实的校名和人名 3.词数80﹣100 4.短文的开头已给出不计入总词数. MySchoolLife I'mLiHuafromSunnyHillMiddleSchoolinChina.I'dliketosharemyschoollifewithyou.
InternationalMuseumDayiscoming.Herearesomespecialmuseumsthatyoumustsee. 1Ifyou'reinterestedinartundertheseayoumaygoto. A.SweetMuseum B.CancunUnderwaterMuseum C.MuseumofFailure D.MuseumofBrokenRelationships 2AccordingtothepassagewhichofthefollowingisTRUE? A.PeoplecantastethecandiesonshowinSweetMuseum. B.PeoplelearnaboutsuccessstoriesinMuseumofFailure. C.ObjectsinMuseumofBrokenRelationshipshavetheirstories. D.ThematerialofsculpturesinCancunUnderwaterMuseumisharmful. 3Thepassageisprobablyfromthecolumn栏目ofinamagazine. A.Culture B.Health C.Sports D.Food
当为手机充电时插在插座的充电器两脚间电压为V．教室里的班班通电源连接线采用三脚插头插头上标有字母的导线和用电器的金属外壳相连当三脚插头插入三孔插座时就将外壳与相连能够有效预防触电事故的发生．
用图象可以表示物体的运动规律如图所示是甲乙两物体由同一地点O出发沿同一直线到达同一目的地x2的运动时间和路程的关系图象．从图象分析得出在0﹣t1的时间内甲物体的运动速度“大于”“小于”“等于”乙物体的运动速度在t1﹣t2的时间内以甲物体为参照物乙物体作“靠近”“远离”甲物体的运动全过程中甲物体的平均速度“大于”“小于”“等于”乙物体的平均速度．
Intheparkyouseeagroupofpeoplealllookingupatthesky.Withoutthinkingaboutityoulookupwardstoo.Why?Intheconcertsomeonebeginstoclapandsuddenlythewholeroomjoinsin.Youdotoo.Why? Sometimeswefeelweareactingcorrectlywhenwedothesameasothers.Themorepeoplefollowanideathebetterortruerwethinktheideais.It'sthesocialproof社会认同感thatworks. ThescientistAschcarriedoutanexperiment.Itshowshowsocialproofcaninfluenceus.InaroomamanisshownLine1andnexttoitarethreelinesABC.AislongerCisshorterandBisaslongasLine1.HemusttellwhichofthethreelinesisaslongasLine1.WhenthemanisalonehegivesthecorrectanswerB.ThenfiveothermenentertheroomandeachofthemgivestheanswerCastheyweretoldto.NowthemanchangeshisideaandgivestheanswerC.Aschgotthesameresultmanytimesamongdifferentsubjects实验对象. Whydoweactlikethis?Wellinthepastfollowingotherswasawaytokeepfromdanger.Supposethat5000yearsagoyouwerehunting打猎withfriends.Suddenlytheyallranaway.Whatwouldyouhavedone?Wouldyouhavestayed?Noyouwouldhaveruntoo.Wearedescendants后代ofthosewhocopiedothers'action.Itissodeeplyplantedinourmindthatwestilluseitnow. Socialproofhasspecialpower.Theadvertisingindustryforexampleoftenmakesuseofit.Sobecarefulwheneveracompanysaysitsproductisthemostpopular. 1Atthebeginningofthepassagethewriterleadsinthetopicby. A.tellingastory B.givingexamples C.answeringquestions D.showingamap 2AccordingtoParagraph3theexperimentbyAschshows. A.followingothersisalwaysright B.socialproofmaychangepeople'sideas C.it'sdifficulttocarryouttheexperiment D.peoplecanstudybetteriftheyarealone 3TheunderlinedwordItinParagraph4refersto. A.runningwithothers B.huntingwithfriends C.copyingothers'action D.doingsomethingdifferent 4Accordingtothepassagewecaninfer推断that. A.it'simportanttorunwithothersanytime B.productsintheadvertisementarethebest C.wemustn'tcopyothers'actiontokeepsafe D.weneedtothinktwicebeforefollowingothers
DoyouplayAntForest?Itis1onlinegameonAlipay支付宝.Players2collectenergybydoingsomethingenvironmentally﹣friendly.Theycangrowandwater3theyowntreeswiththeenergy.4thetreesarebigenoughAlipaywithsomeothercompanieswillplantrealtreesinthedesert沙漠areaofChina.Everyyearmillionsoftrees5plantinthisway. ThisispartofChina'stree﹣plantingprogram.Ithopes6stopthedesertfrombecominglarger.Since1978Chinahasplantedover66billiontrees7thenorth.ItisknownastheGreatGreenWall.ForexampleSaihanbainHebeiProvincewasonceadesert8nowithasbecomethebiggestman﹣madeforestinChina. Chinaismakingtheworldmuch9greenthanbefore.Itsetsagoodexampleandhasmany10lessontosharewiththeworld''saidtheUnitedNationsEnvironmentProgram.
Asiatreatsilentanybodypayfor 1Hearingthebadnewshesatdown. 2SpringFestivaliscelebratedinmanycountries. 3It'sterriblyhotoutside.Thereisn'tinthesquare. 4Theoldmantakesgoodcareofhisdoganditasafriend. 5I'msoexcitedthatmyparentsagreedtomytriptoFrance.
DoyouplayAntForest?Itis1onlinegameonAlipay支付宝.Players2collectenergybydoingsomethingenvironmentally﹣friendly.Theycangrowandwater3theyowntreeswiththeenergy.4thetreesarebigenoughAlipaywithsomeothercompanieswillplantrealtreesinthedesert沙漠areaofChina.Everyyearmillionsoftrees5plantinthisway. ThisispartofChina'stree﹣plantingprogram.Ithopes6stopthedesertfrombecominglarger.Since1978Chinahasplantedover66billiontrees7thenorth.ItisknownastheGreatGreenWall.ForexampleSaihanbainHebeiProvincewasonceadesert8nowithasbecomethebiggestman﹣madeforestinChina. Chinaismakingtheworldmuch9greenthanbefore.Itsetsagoodexampleandhasmany10lessontosharewiththeworld''saidtheUnitedNationsEnvironmentProgram.
为了探究冰熔化和水沸腾时温度的变化规律君君同学进行了如下操作 1为完成这个实验她准备的器材有烧杯酒精灯铁架台温度计还需要的测量仪器是． 2用图甲所示装置探究冰熔化时温度变化规律把装有初温为℃如图乙所测碎冰的烧杯直接放置在空气中不用酒精灯加热．这样做不但能使烧杯均匀受热而且冰的温度升高较选填“快”或“慢”便于记录各个时刻的温度． 3等冰完全熔化完后在烧杯下方放入酒精灯如图丙加热一段时间后水沸腾则水沸腾时温度变化的特点是． 4君君根据记录的数据绘制了如图丁所示的曲线由曲线可知冰是选填“晶体”或“非晶体”此实验测得水沸腾时的温度比100℃小的原因是．
液体和空气接触的表面存在一个薄层﹣﹣表面层如图所示．由于液体分子做表面层中就存在一些具有较大能量的分子它们可以克服分子间相互作用的力脱离液体跑到空气中去．其宏观表现就是液体的填物态变化名称．
如图是一辆轿车的后视镜示意图O点为司机眼部所在位置司机能通过右侧后视镜AB看到平面镜看到车位C点根据平面镜成像规律画出司机眼睛O看到C点的光路图．
DoyouplayAntForest?Itis1onlinegameonAlipay支付宝.Players2collectenergybydoingsomethingenvironmentally﹣friendly.Theycangrowandwater3theyowntreeswiththeenergy.4thetreesarebigenoughAlipaywithsomeothercompanieswillplantrealtreesinthedesert沙漠areaofChina.Everyyearmillionsoftrees5plantinthisway. ThisispartofChina'stree﹣plantingprogram.Ithopes6stopthedesertfrombecominglarger.Since1978Chinahasplantedover66billiontrees7thenorth.ItisknownastheGreatGreenWall.ForexampleSaihanbainHebeiProvincewasonceadesert8nowithasbecomethebiggestman﹣madeforestinChina. Chinaismakingtheworldmuch9greenthanbefore.Itsetsagoodexampleandhasmany10lessontosharewiththeworld''saidtheUnitedNationsEnvironmentProgram.
阅读共享单车后回答． 共享单车 骑自行车出行有很多益处不仅可以节能减排缓解交通压力而且骑车时人需要消耗体能可以强身健体．一个成年人在水平路面上骑车时所受阻力大约20N． 近年来我国多个城市推出了多种新型共享单车广州市的许多街道旁也随处可见如图甲所示这种单车外观结构简单单车的质量约25kg比普通自行车质量要大些． 单车的车锁内集成了嵌入式芯片GPS定位模块和SIM卡等便于监控单车的具体位置和状态．其工作原理如图乙所示．用户可使用手机下载单车APP查看并找到单车的位置然后用手机扫描车身上的二维码通过手机网络发送电磁波到云端请求解锁云端收到请求后识别该车辆并发送解镇指令单车执行解锁指令自动开锁用户便可以开始骑行手机AP就显示计时计价等信息．此外当用户在骑行过程中踩动脚踏板可将机械能转化为电能为车内蓄电池充电以满足单车定位和自动开锁等过程中的用电需要． 请根据上述材料回答下列问题 1此种单车和手机之间是利用传递信息的若此种单车使用的GPS信号的频率是1800GHz而手机中蓝牙通信信号电磁波的频率是25GHz则该GPS信号的波长手机蓝牙通信信号的波长选填“大于“或“小于”． 2单车在骑行过程中可将机械能转化为电能是利用现象实现的．乐乐某次扫码后骑行8km耗时30min此次骑行的平均速度为km/h． 3一个成年人在水平路面上以正常的速度保持匀速骑行半小时消耗的能量最接近． A.2×103JB.2×105JC.2×107JD.2×109J 4乐乐放学回家途中把自行车骑得飞快妈妈看见后警告他说“以后骑自行车慢点不然很危险”是因为质量一定时速度越大越大行驶中危险性大．
Intheparkyouseeagroupofpeoplealllookingupatthesky.Withoutthinkingaboutityoulookupwardstoo.Why?Intheconcertsomeonebeginstoclapandsuddenlythewholeroomjoinsin.Youdotoo.Why? Sometimeswefeelweareactingcorrectlywhenwedothesameasothers.Themorepeoplefollowanideathebetterortruerwethinktheideais.It'sthesocialproof社会认同感thatworks. ThescientistAschcarriedoutanexperiment.Itshowshowsocialproofcaninfluenceus.InaroomamanisshownLine1andnexttoitarethreelinesABC.AislongerCisshorterandBisaslongasLine1.HemusttellwhichofthethreelinesisaslongasLine1.WhenthemanisalonehegivesthecorrectanswerB.ThenfiveothermenentertheroomandeachofthemgivestheanswerCastheyweretoldto.NowthemanchangeshisideaandgivestheanswerC.Aschgotthesameresultmanytimesamongdifferentsubjects实验对象. Whydoweactlikethis?Wellinthepastfollowingotherswasawaytokeepfromdanger.Supposethat5000yearsagoyouwerehunting打猎withfriends.Suddenlytheyallranaway.Whatwouldyouhavedone?Wouldyouhavestayed?Noyouwouldhaveruntoo.Wearedescendants后代ofthosewhocopiedothers'action.Itissodeeplyplantedinourmindthatwestilluseitnow. Socialproofhasspecialpower.Theadvertisingindustryforexampleoftenmakesuseofit.Sobecarefulwheneveracompanysaysitsproductisthemostpopular. 1Atthebeginningofthepassagethewriterleadsinthetopicby. A.tellingastory B.givingexamples C.answeringquestions D.showingamap 2AccordingtoParagraph3theexperimentbyAschshows. A.followingothersisalwaysright B.socialproofmaychangepeople'sideas C.it'sdifficulttocarryouttheexperiment D.peoplecanstudybetteriftheyarealone 3TheunderlinedwordItinParagraph4refersto. A.runningwithothers B.huntingwithfriends C.copyingothers'action D.doingsomethingdifferent 4Accordingtothepassagewecaninfer推断that. A.it'simportanttorunwithothersanytime B.productsintheadvertisementarethebest C.wemustn'tcopyothers'actiontokeepsafe D.weneedtothinktwicebeforefollowingothers
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