Addition of a(n) ___ group to certain lysine residues of a histone protein makes the region of chromatin transcriptionally _; addition of a(n) _ group to certain lysine residues makes the region of chromatin transcriptionally ___.

Addition of a(n) methyl group to certain lysine residues of a histone protein makes the region of chromatin transcriptionally silent; addition of a(n) acetyl group to certain lysine residues makes the region of chromatin transcriptionally active.

Explanation:

The changes suffered in the expression and activity of the genes are studied by the Epigenetics.

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Addition of a(n) _____ group to certain lysine residues of a histone protein makes the region of chromatin transcriptionally _____; addition of a(n) _____ group to certain lysine residues makes the region of chromatin transcriptionally _____.

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Addition of a(n) ___ group to certain lysine residues of a histone protein makes the region of chromatin transcriptionally _; addition of a(n) _ group to certain lysine residues makes the region of chromatin transcriptionally ___.