16S rRNA from Archea has general similarities in secondary structure(folding)but numerous differences in primary structure (sequence). 大肠埃希氏菌 万氏甲烷球菌 酿酒酵母 Escherichia coli) Methanococcus vannielii) Saccharomyces cerevisiae 图12-1三界生物的16 SrRNA的比较 (图中粗黑线表示真细菌和古生菌的差异)16S rRNA from Archea has general similarities in secondary structure (folding) but numerous differences in primary structure (sequence)