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败酱草、鱼腥草都具有的功效是（）
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治肠痈宜选用
鱼腥草
败酱草
龙胆草
蒲公英
苦参
以下不宜久煎的药物是
红藤
蒲公英
鱼腥草
败酱草
不宜久煎
白鲜皮
败酱草
鱼腥草
黄柏
地骨皮
有治疗乳痈功效的是
败酱草
金银花
鱼腥草
蒲公英
连翘
善于治疗肠痈的药物组是
金银花、连翘
大血藤、败酱草
败酱草、鱼腥草
牡丹皮、赤芍
蒲公英、紫花地丁
具有清热解毒凉血消斑的药物是
败酱草
金银花
鱼腥草
鸦胆子
大青叶
治肺痈宜选用
鱼腥草
败酱草
龙胆草
蒲公英
苦参
治乳痈宜选用
鱼腥草
败酱草
龙胆草
蒲公英
苦参
善于治疗肠痈的药物组是
金银花、连翘
红藤、败酱草
败酱草、鱼腥草
牡丹皮、赤芍
蒲公英、紫花地丁
治疗肠痈当首选的药组是
鱼腥草,重楼
紫花地丁,野菊花
金银花,连翘
蒲公英,鱼腥草
败酱草,大血藤
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Everybodylovesafatpayrise.Yetpleasureatyourowncanvanishifyoulearnthatacolleaguehasbeengivenabiggerone.Indeedifhehasareputationforslackingyoumightevenbeoutraged.Suchbehaviourisregardedasalltoohumanwiththeunderlyingassumptionthatotheranimalswouldnotbecapableofthisfinelydevelopedsenseofgrievance.ButastudybySarahBrosnanandFransdeWaalofEmoryUniversityinAtlantaGeorgiawhichhasjustbeenpublishedinNaturesuggeststhatitisalltoomonkeyaswell. Theresearchersstudiedthebehaviouroffemalebrowncapuchinmonkeys.Theylookcute.Theyaregood-naturedco-operativecreaturesandtheysharetheirfoodreadily.Aboveallliketheirfemalehumancounterpartstheytendtopaymuchcloserattentiontothevalueofgoodsandservicesthanmales. SuchcharacteristicsmakethemperfectcandidatesforDr.Brosnan’sandDr.deWaal’sstudy.Theresearchersspenttwoyearsteachingtheirmonkeystoexchangetokensforfood.Normallythemonkeyswerehappyenoughtoexchangepiecesofrockforslicesofcucumber.Howeverwhentwomonkeyswereplacedinseparatebutadjoiningchamberssothateachcouldobservewhattheotherwasgettinginreturnforitsrocktheirbehaviourbecamemarkedlydifferent. Intheworldofcapuchinsgrapesareluxurygoodsandmuchpreferabletocucumbers.Sowhenonemonkeywashandedagrapeinexchangeforhertokenthesecondwasreluctanttohandhersoverforamerepieceofcucumber.Andifonereceivedagrapewithouthavingtoprovidehertokeninexchangeatalltheothereithertossedherowntokenattheresearcheroroutofthechamberorrefusedtoacceptthesliceofcucumber.Indeedthemerepresenceofagrapeintheotherchamberwithoutanactualmonkeytoeatitwasenoughtoinduceresentmentinafemalecapuchin. Theresearcherssuggestthatcapuchinmonkeyslikehumansareguidedbysocialemotions.Inthewildtheyareaco-operativegroup-livingspecies.Suchco-operationislikelytobestableonlywheneachanimalfeelsitisnotbeingcheated.Feelingsofrighteousndignationitseemsarenotthepreserveofpeoplealone.Refusingalesserrewardcompletelymakesthesefeelingsabundantlycleartoothermembersofthegroup.Howeverwhethersuchasenseoffairnessevolvedindependentlyincapuchinsandhumansorwhetheritstemsfromthecommonancestorthatthespecieshad35millionyearsagoisasyetanunansweredquestion. Intheopeningparagraphtheauthorintroduceshistopicby
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Ofallthecomponentsofagoodnight’ssleepdreamsseemtobeleastwithinourcontrol.Indreamsawindowopensintoaworldwherelogicissuspendedanddeadpeoplespeak.AcenturyagoFreudformulatedhisrevolutionarytheorythatdreamswerethedisguisedshadowsofourunconsciousdesiresandfears;bythelate1970sneurologistshadswitchedtothinkingofthemasjustmentalnoise―therandombyproductsoftheneural-repairworkthatgoesonduringsleep.Nowresearcherssuspectthatdreamsarepartofthemind’semotionalthermostatregulatingmoodswhilethebrainisoff-line.Andoneleadingauthoritysaysthattheseintenselypowerfulmentaleventscanbenotonlyharnessedbutactuallybroughtunderconsciouscontroltohelpussleepandfeelbetter.It’syourdreamsaysRosalindCartwrightchairofpsychologyatChicago’sMedicalCenter.Ifyoudon’tlikeitchangeit. Evidencefrombrainimagingsupportsthisview.ThebrainisasactiveduringREMrapideyemovementsleep―whenmostvividdreamsoccur―asitiswhenfullyawakesaysDr.EricNofzingerattheUniversityofPittsburgh.Butnotallpartsofthebrainareequallyinvolved;thelimbicsystemtheemotionalbrainisespeciallyactivewhiletheprefrontalcortexthecenterofintellectandreasoningisrelativelyquiet.WewakeupfromdreamshappyordepressedandthosefeelingscanstaywithusalldaysaysStanfordsleepresearcherDr.WilliamDement. ThelinkbetweendreamsandemotionsshowsupamongthepatientsinCartwright’sclinic.Mostpeopleseemtohavemorebaddreamsearlyinthenightprogressingtowardhappieronesbeforeawakeningsuggestingthattheyareworkingthroughnegativefeelingsgeneratedduringtheday.Becauseourconsciousmindisoccupiedwithdailylifewedon’talwaysthinkabouttheemotionalsignificanceoftheday’sevents―untilitappearswebegintodream. Andthisprocessneednotbelefttotheunconscious.Cartwrightbelievesonecanexerciseconsciouscontroloverrecurringbaddreams.Assoonasyouawakenidentifywhatisupsettingaboutthedream.Visualizehowyouwouldlikeittoendinstead;thenexttimeitoccurstrytowakeupjustenoughtocontrolitscourse.Withmuchpracticepeoplecanlearntoliterallydoitintheirsleep. Attheendofthedaythere’sprobablylittlereasontopayattentiontoourdreamsatallunlesstheykeepusfromsleepingorwewakeupinapanicCartwrightsays.Terrorismeconomicuncertaintiesandgeneralfeelingsofinsecurityhaveincreasedpeople’sanxiety.Thosesufferingfrompersistentnightmaresshouldseekhelpfromatherapist.Fortherestofusthebrainhasitswaysofworkingthroughbadfeelings.Sleeporratherdream―onitandyou’llfeelbetterinthemorning. Cartwrightseemstosuggestthat
移码突变
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
异配性别
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
AmericansnolongerexpectpublicfigureswhetherinspeechorinwritingtocommandtheEnglishlanguagewithskillandgift.Nordotheyaspiretosuchcommandthemselves.InhislatestbookDoingOurOwnThing:TheDegradationofLanguageandMusicandWhyWeShouldLikeCareJohnMcWhorteralinguistandcontroversialistofmixedliberalandconservativeviewsseesthetriumphof1960scounter-cultureasresponsibleforthedeclineofformalEnglish. Blamingthepermissive1960sisnothingnewbutthisisnotyetanothercriticismagainstthedeclineineducation.Mr.McWhorter’sacademicspecialityislanguagehistoryandchangeandheseesthegradualdisappearanceofwhomforexampletobenaturalandnomoreregrettablethanthelossofthecase-endingsofOldEnglish. Butthecultoftheauthenticandthepersonaldoingourownthinghasspeltthedeathofformalspeechwritingpoetryandmusic.Whileeventhemodestlyeducatedsoughtanelevatedtonewhentheyputpentopaperbeforethe1960seventhemostwellregardedwritingsincethenhassoughttocapturespokenEnglishonthepage.Equallyinpoetrythehighlypersonalperformativegenreistheonlyformthatcouldclaimrealliveliness.InbothoralandwrittenEnglishtalkingstriumphingoverspeakingspontaneityovercraft. IllustratedwithanentertainingarrayofexamplesfrombothhighandlowculturethetrendthatMr.McWhorterdocumentsisunmistakable.Butitislesscleartotakethequestionofhissubtitlewhyweshouldlikecare.Asalinguistheacknowledgesthatallvarietiesofhumanlanguageincludingnon-standardoneslikeBlackEnglishcanbepowerfullyexpressive--thereexistsnolanguageordialectintheworldthatcannotconveycomplexideas.Heisnotarguingasmanydothatwecannolongerthinkstraightbecausewedonottalkproper. RussianshaveadeeplovefortheirownlanguageandcarrylargechunksofmemorizedpoetryintheirheadswhileItalianpoliticianstendtoelaboratespeechthatwouldseemold-fashionedtomostEnglish-speakers.Mr.McWhorteracknowledgesthatformallanguageisnotstrictlynecessaryandproposesnoradicaleducationreforms--heisreallygrievingoverthelossofsomethingbeautifulmorethanuseful.WenowtakeourEnglishonpaperplatesinsteadofchina.Ashameperhapsbutprobablyaninevitableone. Accordingtothelastparagraphpaperplatesistochinaas
新生儿溶血症
AmericansnolongerexpectpublicfigureswhetherinspeechorinwritingtocommandtheEnglishlanguagewithskillandgift.Nordotheyaspiretosuchcommandthemselves.InhislatestbookDoingOurOwnThing:TheDegradationofLanguageandMusicandWhyWeShouldLikeCareJohnMcWhorteralinguistandcontroversialistofmixedliberalandconservativeviewsseesthetriumphof1960scounter-cultureasresponsibleforthedeclineofformalEnglish. Blamingthepermissive1960sisnothingnewbutthisisnotyetanothercriticismagainstthedeclineineducation.Mr.McWhorter’sacademicspecialityislanguagehistoryandchangeandheseesthegradualdisappearanceofwhomforexampletobenaturalandnomoreregrettablethanthelossofthecase-endingsofOldEnglish. Butthecultoftheauthenticandthepersonaldoingourownthinghasspeltthedeathofformalspeechwritingpoetryandmusic.Whileeventhemodestlyeducatedsoughtanelevatedtonewhentheyputpentopaperbeforethe1960seventhemostwellregardedwritingsincethenhassoughttocapturespokenEnglishonthepage.Equallyinpoetrythehighlypersonalperformativegenreistheonlyformthatcouldclaimrealliveliness.InbothoralandwrittenEnglishtalkingstriumphingoverspeakingspontaneityovercraft. IllustratedwithanentertainingarrayofexamplesfrombothhighandlowculturethetrendthatMr.McWhorterdocumentsisunmistakable.Butitislesscleartotakethequestionofhissubtitlewhyweshouldlikecare.Asalinguistheacknowledgesthatallvarietiesofhumanlanguageincludingnon-standardoneslikeBlackEnglishcanbepowerfullyexpressive--thereexistsnolanguageordialectintheworldthatcannotconveycomplexideas.Heisnotarguingasmanydothatwecannolongerthinkstraightbecausewedonottalkproper. RussianshaveadeeplovefortheirownlanguageandcarrylargechunksofmemorizedpoetryintheirheadswhileItalianpoliticianstendtoelaboratespeechthatwouldseemold-fashionedtomostEnglish-speakers.Mr.McWhorteracknowledgesthatformallanguageisnotstrictlynecessaryandproposesnoradicaleducationreforms--heisreallygrievingoverthelossofsomethingbeautifulmorethanuseful.WenowtakeourEnglishonpaperplatesinsteadofchina.Ashameperhapsbutprobablyaninevitableone. TowhichofthefollowingstatementswouldMcWhortermostlikelyagree?
孟德尔的植物杂交试验的论文于1866年正式发表后沉睡了34年未受重视直到1900年才被重新发现请简述这段重新发现的史实分析孟德尔的论文被埋没和重新发现的原因并对孟德尔的科学贡献作一简明而全面的评价
标记基因
AmericansnolongerexpectpublicfigureswhetherinspeechorinwritingtocommandtheEnglishlanguagewithskillandgift.Nordotheyaspiretosuchcommandthemselves.InhislatestbookDoingOurOwnThing:TheDegradationofLanguageandMusicandWhyWeShouldLikeCareJohnMcWhorteralinguistandcontroversialistofmixedliberalandconservativeviewsseesthetriumphof1960scounter-cultureasresponsibleforthedeclineofformalEnglish. Blamingthepermissive1960sisnothingnewbutthisisnotyetanothercriticismagainstthedeclineineducation.Mr.McWhorter’sacademicspecialityislanguagehistoryandchangeandheseesthegradualdisappearanceofwhomforexampletobenaturalandnomoreregrettablethanthelossofthecase-endingsofOldEnglish. Butthecultoftheauthenticandthepersonaldoingourownthinghasspeltthedeathofformalspeechwritingpoetryandmusic.Whileeventhemodestlyeducatedsoughtanelevatedtonewhentheyputpentopaperbeforethe1960seventhemostwellregardedwritingsincethenhassoughttocapturespokenEnglishonthepage.Equallyinpoetrythehighlypersonalperformativegenreistheonlyformthatcouldclaimrealliveliness.InbothoralandwrittenEnglishtalkingstriumphingoverspeakingspontaneityovercraft. IllustratedwithanentertainingarrayofexamplesfrombothhighandlowculturethetrendthatMr.McWhorterdocumentsisunmistakable.Butitislesscleartotakethequestionofhissubtitlewhyweshouldlikecare.Asalinguistheacknowledgesthatallvarietiesofhumanlanguageincludingnon-standardoneslikeBlackEnglishcanbepowerfullyexpressive--thereexistsnolanguageordialectintheworldthatcannotconveycomplexideas.Heisnotarguingasmanydothatwecannolongerthinkstraightbecausewedonottalkproper. RussianshaveadeeplovefortheirownlanguageandcarrylargechunksofmemorizedpoetryintheirheadswhileItalianpoliticianstendtoelaboratespeechthatwouldseemold-fashionedtomostEnglish-speakers.Mr.McWhorteracknowledgesthatformallanguageisnotstrictlynecessaryandproposesnoradicaleducationreforms--heisreallygrievingoverthelossofsomethingbeautifulmorethanuseful.WenowtakeourEnglishonpaperplatesinsteadofchina.Ashameperhapsbutprobablyaninevitableone. AccordingtoMcWhorterthedeclineofformalEnglish
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
从突变的分子基础看能否实现定向变异为什么通常从一个野生型基因变成突变型的频率总是显著地高于回复突变率如何解释
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
隔离屏障
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
用噬菌体P1进行普遍性转导供体菌的标记是pur+nad-pdx+受体菌的标记是put-nad+pdx-转导后选择具有pur+的转导子然后在1000个pur+转导子中检定其他供体菌的标记是否同时转导过来具体结果如下 请问 1．put和nad的共转导频率是多少 2．pur和pdx的共转导频率是多少 3．nad和pdx在pur的同一边还是在它的两侧 4．你能作出这三个标记基因的遗传连锁图吗请在此基础上解释上述的实验结果
Ofallthecomponentsofagoodnight’ssleepdreamsseemtobeleastwithinourcontrol.Indreamsawindowopensintoaworldwherelogicissuspendedanddeadpeoplespeak.AcenturyagoFreudformulatedhisrevolutionarytheorythatdreamswerethedisguisedshadowsofourunconsciousdesiresandfears;bythelate1970sneurologistshadswitchedtothinkingofthemasjustmentalnoise―therandombyproductsoftheneural-repairworkthatgoesonduringsleep.Nowresearcherssuspectthatdreamsarepartofthemind’semotionalthermostatregulatingmoodswhilethebrainisoff-line.Andoneleadingauthoritysaysthattheseintenselypowerfulmentaleventscanbenotonlyharnessedbutactuallybroughtunderconsciouscontroltohelpussleepandfeelbetter.It’syourdreamsaysRosalindCartwrightchairofpsychologyatChicago’sMedicalCenter.Ifyoudon’tlikeitchangeit. Evidencefrombrainimagingsupportsthisview.ThebrainisasactiveduringREMrapideyemovementsleep―whenmostvividdreamsoccur―asitiswhenfullyawakesaysDr.EricNofzingerattheUniversityofPittsburgh.Butnotallpartsofthebrainareequallyinvolved;thelimbicsystemtheemotionalbrainisespeciallyactivewhiletheprefrontalcortexthecenterofintellectandreasoningisrelativelyquiet.WewakeupfromdreamshappyordepressedandthosefeelingscanstaywithusalldaysaysStanfordsleepresearcherDr.WilliamDement. ThelinkbetweendreamsandemotionsshowsupamongthepatientsinCartwright’sclinic.Mostpeopleseemtohavemorebaddreamsearlyinthenightprogressingtowardhappieronesbeforeawakeningsuggestingthattheyareworkingthroughnegativefeelingsgeneratedduringtheday.Becauseourconsciousmindisoccupiedwithdailylifewedon’talwaysthinkabouttheemotionalsignificanceoftheday’sevents―untilitappearswebegintodream. Andthisprocessneednotbelefttotheunconscious.Cartwrightbelievesonecanexerciseconsciouscontroloverrecurringbaddreams.Assoonasyouawakenidentifywhatisupsettingaboutthedream.Visualizehowyouwouldlikeittoendinstead;thenexttimeitoccurstrytowakeupjustenoughtocontrolitscourse.Withmuchpracticepeoplecanlearntoliterallydoitintheirsleep. Attheendofthedaythere’sprobablylittlereasontopayattentiontoourdreamsatallunlesstheykeepusfromsleepingorwewakeupinapanicCartwrightsays.Terrorismeconomicuncertaintiesandgeneralfeelingsofinsecurityhaveincreasedpeople’sanxiety.Thosesufferingfrompersistentnightmaresshouldseekhelpfromatherapist.Fortherestofusthebrainhasitswaysofworkingthroughbadfeelings.Sleeporratherdream―onitandyou’llfeelbetterinthemorning. Byreferringtothelimbicsystemtheauthorintendstoshow
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