Which statements about the modification of chromatin structure in eukaryotes are true?

Which statements about the modification of chromatin structure in eukaryotes are true?

The answer is :

Acetylation of histone tails is a reversible process.
DNA is not transcribed when chromatin is packaged tightly in a condensed form.
Some forms of chromatin modification can be passed on to future generations of cells.
Methylation of histone tails in chromatin can promote condensation of the chromatin.
Acetylation of histone tails in chromatin allows access to DNA for transcription.

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