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Cell Cycle and Division
How Eukaryotic DNA Fits Inside the Nucleus
Description
Eukaryotic DNA fits inside the nucleus by packing into a highly compact form. Eukaryotes have large genomes compared with prokaryotes, so their DNA must be tightly organized to fit inside one cell.
The process starts when DNA wraps around proteins called histones. These DNA-histone units form nuc...
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Transcript
在真核生物中 双链DNA
在膜结合核内组织特异
以适应细胞的有限空间
在第一级压实中
DNA被紧紧包裹在称为组蛋白的
特定蛋白质周围
组蛋白核心和缠绕在其周围的DNA
一起被称为核小体
DNA包装的基本单位
核小体通过接头DNA
连成一串
在下一级包装中
核小体和接头DNA
缠绕形成染色质纤维
最后 额外的纤维蛋白质
压缩染色质甚至进一步
允许如此长的DNA
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