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Good morning students. Today we will be talking about DNA packing. Proteins compact DNA into the nucleus. These proteins are called histones and the resulting DNA-protein complex is chromatin.
The energy needed to pack this DNA is provided by the histones. The nucleosome is the basic repeating structural unit of chromatin. Packing DNA into nucleosomes shortens the fiber length. DNA will then become a "string of beads".
When Eukaryotic cells divide, DNA must be split equally between daughter cells. DNA becomes highly compact into the metaphase chromosomes we see. Once the cell divides, chromosomes uncoil again. Thats all for todays lesson on DNA packing.
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