文档介绍:核苷酸和核酸Informationtransferinacell细胞中信息的转化Thebases,nucleosideandNucleotide碱基、核苷、核苷酸BasicStructureofnucleicacids核酸结构Classesofnucleicacids核酸的类型Hydrolysesofnucleicacids核酸的水解Informationtransferinacell细胞中信息的转化DNAistransformingmaterial(DNA是转化物质)InformationflowandCentraldogma信息流与中心法则DNAistransformingmaterial(DNA是转化物质)Griffth’stransformingexperiments(1928)showedsomematerialsinsidetheSstrainhadtransferredtoLiveRstrain证明细胞内物质能在细胞间转化OTAverytestifiedthetransformingsubstancewasDNA(1944)证明转化物质是DNAAHersheyandMChasefurthertestifiedtransformingsubstancewasDNAbyinfectionofbacteriawithT2(1952)进一步通过噬菌体T2对细菌感染的试验证明转化物质是DNAQuestion:,nucleosideandNucleotide(碱基、核苷、核苷酸)Nucleoside=base-monsugarsNucleotide=Nucleoside-monbases,nucleosidesandnucleotides常见碱基,核苷和核苷酸名称HighenergyPhosophoesterbonds高能磷酯键Otherimportantformsofnucleotides其它重要核苷酸类型TwotypesofbasesinnucleicacidsPyrimidine嘧啶Purine嘌呤Uracil尿嘧啶Thymine胸腺嘧啶Cytosine胞嘧啶Guanine鸟嘌呤Adenine腺嘌呤(onlyinRNA)(onlyinDNA)InbothDNAandRNA