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Problem: Briefly describe the structure of eukaryotic chromatin. Cite two mechanisms by which that structure can be modified (from euchromatin to heterochromatin). Explain how these modifications can affect transcription.

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Eukaryotic chromatin looks like beads on a string. The beads are called nucleosomes. Each nucleosome is composed of DNA wrapped around eight proteins called histones. The nucleosomes are then wrapped into a 30 nm spiral called a solenoid, where additional histone proteins support the chromatin structure. 

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Briefly describe the structure of eukaryotic chromatin. Cite two mechanisms by which that structure can be modified (from euchromatin to heterochromatin). Explain how these modifications can affect transcription.

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