端粒是位于染色体两端的特殊dna序列随细胞分裂次数的增加而变短癌细胞中因存在延长染色体端粒的端粒酶而可以无限增殖.据此推断 A正常 Template




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tomski端粒是位于染色体两端的特殊dna序列随细胞分裂次数的增加而变短癌细胞中因存在延长染色体端粒的端粒酶而可以无限增殖.据此推断 a正常 coloring