真核生物染色体ＤＮＡ均呈线性结构。早在半个世纪前 ,人们就已经发现其染色体末端是由具有特殊结构及重要功能的端粒组成。但直到近年才从分子水平提示了端粒的结构、作用及合成途径。现发现端粒主要是由种属特异性的简单重复ＤＮＡ序列与端粒酶结合蛋白质构成。人类的端粒重? Eukaryotic chromosomal DNA showed a linear structure. As early as half a century ago, people have found that their chromosome ends are composed of telomeres with special structure and important functions. However, it has not been possible to elucidate the structure, function and synthesis of telomeres at the molecular level until recent years. It has been found that telomeres are mainly composed of species-specific simple repeat DNA sequences and telomerase-binding proteins. Human telomere weight?