遗传物质的复制 双链DNA的复制 (半保留复制) DNA REPLICATING ITSELF DNA 1 OLD NEW 代DN NEW
遗传物质的复制-双链DNA的复制 （半保留复制）
遗传物质的复制一一一一一一 双链DNA的复制 (半保留复制 Semi-conservative Replication 0ka2ak灯 fragments Replication Bubble 3 Okazaki fragments (c)2000 Chemis
遗传物质的复制-双链DNA的复制 （半保留复制）
DNA与遗传密码 Second base of codon U A UUU UCU UAU Phe UGU U UUC UCC SER UAC Tyr Cys UGC UUA UCA UUG Leu UAA UGA UCG UAG UGG Trp CUU CCU CAU His CGU CUC Leu ccc Pro CAC CGC CUA CCA Arg CAA GIn CGA A CUG CCG CAG CGG AUU ACU AAU Asn AGU Ser U A AUC ACC AAC AGC Thy AUA ACA AAA Met ACG AAG Lys AGA AUG AGG Arg GUU GCU GAU Asp GGU GUC GCC GAC GGC A GUA GCA GAA GGA GUG GCG CAG GGG 6 The genetic code,written by convention in the form in which the Codons appear in mRNA.The three terminator codons,UAA,UAG,and UGA,are boxed in red;the AUG initiator codon is shown in green
DNA与遗传密码
DNA与遗传密码 由A、T(U)、C、G组成的三联体密码 tRNA AUG mRNA 3 2nd base in codon G Tyr U STOP 8 STOP ST0口 Trp His His Leu 8 GIn GIn Arg 3rdbase incodon Asn Ser A Ser G 翻 墨 J0aobuaoboao The Genetic Code
DNA与遗传密码 -由A、T（U）、C、G 组成的三联体密码
tRNA的结构 Amino Acid link -C-N2H Amino Acid tRNA 0 R Acceptor arm mG TyCG loop OCRUECE Anticodon OCGO C Anticodon loop m1 GO Anticodon 99四-s Codon mRNA Fig The primary struture of yeast alanine tRNA (tRNA1) the first such sequence determined.This molecule is sythesized from the nucleotides A,C,G,and U,but some and m=methyl group.The primary structure can be diagrammed as a cloverleaf consisting of four base-paired stems and three loops:the D loop (fo dihydrouridine,a virtually constant constituent of this loop):the anticodon loop:and the TCG loop (for thymidylate,pseudouridylote.cytiagret negte, which are aloost always present in As discussed later,attachment of an aino acid to the acceptor arm yields an aminoacyl-tRNA
tRNA 的结构