细菌在15 N培养基中繁殖数代后使细菌dna的含氮碱基皆含有15n然后再移入14n培养基中培养抽取亲代及子代的dna经高速离心分离下图 Template




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tomski细菌在15 n培养基中繁殖数代后使细菌dna的含氮碱基皆含有15n然后再移入14n培养基中培养抽取亲代及子代的dna经高速离心分离下图 coloring