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Biology

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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...

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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