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.
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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