2. Which of statements is INCORRECT for the comparisons of euchromatin and heterochromatin?
(A) euchromatin is more open than heterochromatin in term of its structure
(B) heterochromatin is easier to be accessed by transcription factors
(C) DNAs and histones in heterochromatin all can be modified by methylation
(D) heterochromatin is not modified by acetylation
(E) euchromatin and heterochromatin are regulated by histone modifications
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