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6.D【解析】原核[文]细胞和真核细胞的D[章]NA在复制时都从复[来]制子的复制起始点开[自]始复制,A正确;A[知]一T碱基对只含有2[嘛]个氢键,有利于解旋[答],B正确;细胞内D[案]NA复制时需要解旋[网]酶、DNA聚合酶等[文]多种酶的参与,C正[章]确;真核细胞DNA[来]上有许多个复制子,[自]虽然每一复制子的复[知]制速率低于原核细胞[嘛],但一个DNA分子[答]有多个复制起点开始[案]复制,故总的复制速[网]率可能高于原核细胞[文],D错误
参考范文：Dear[章] Allen.Hea[来]ring you're fascinate[自]d by Chinese knots after you watched the closing ceremony of Beijing WinterOly[知]mpics.I'm too ready to help.Chin[嘛]ese knot is a tradition[答]al hand-made[案] folk art,which[网] is usually presented[文] in various shapes and colors.Ch[章]inese knots are mainly used as decoratio[来]ns and presents to express good wishes.Fo[自]rtunately[知],it happens thatmy grandma is an expert in this craft.She[嘛] has committed[答] her life to it.Theref[案]ore,why not join me in learningt[网]o make Chinese knots from her?If it is convenien[文]t.please come to my home this Sunday,wh[章]en my grandmawi[来]ll be available[自] all the day.Best wishes！Yo[知]urs.Li Hua
