论文部分内容阅读
透射电子显微镜研究表明，质粒ｐＢＲ３２２ ＤＮＡ 分子中有一种特殊的拓扑结构因子，这种拓扑结构因子能阻止超螺旋扭力在整个分子内的传递．细胞内的巨大染色体ＤＮＡ 可能被这种结构分隔成较小的环
Transmission electron microscopy studies have shown that there is a special topology of the pBR322 DNA molecule, a topological factor that prevents the transmission of supercoiled torsion throughout the molecule. Giant chromosomal DNA inside a cell may be separated into smaller loops by this structure